Abstract: The invention provides a method of making .beta."-alumina by heating aluminium oxide in the presence of Na.sub.2 O. A metal oxide dopant in the form of Li.sub.2 O, MgO, ZnO, CoO, NiO, FeO or mixtures thereof, or a precursor of the dopant, is dispersed in a cubic-close packed aluminium oxide or a precursor thereof to form a starting mixture which is calcined by heating to 250.degree.-1100.degree. C. in an oxygen-containing atmosphere. Na.sub.2 O is then dispersed in the calcined starting mixture to form a final mixture, and the final mixture is heated in an oxygen-containing atmosphere to above 1100.degree. C. to produce .beta."-alumina.

Abstract: Process for the manufacture of a powder of mixed metal oxides by cohydrolysis of metal alcoholates in the presence of an acidic organic compound and mixed metal oxide powders in which the molar relationships R.sub.1 and R.sub.2 of a metal oxide to the sum of the metal oxides in the powder and in a particle of the powder are such that ##EQU1## The process applies to powders of zirconia doped with yttrium oxide.

Abstract: A novel anion exchange material comprising substantially crystalline inorganic mixed metal hydroxides and mixed metal hydrated oxides exhibiting anion exchange properties at temperatures up to about 150.degree. C. and a method of preparing the same is disclosed. The anion exchanger composition is prepared by coprecipitating hydroxides or hydrated oxides of metal elements such as aluminum and titanium and then drying the mixed metal hydroxides or hydrated oxides.

Abstract: Proton conductive material comprising a compound of a monoclinic crystal structure which is in a reversibly reduced state from a compound of a similar monoclinic crystal structure represented by the general formula:Na.sub.x Al.sub.y Ti.sup.3+.sub.x-y Ti.sup.4+.sub.8-x O.sub.16,in which 1.5.ltoreq.x.ltoreq.2, 1.5.ltoreq.y.ltoreq.2, x.gtoreq.y.The compund of a monoclinic crystal structure, represented by the general formula: Na.sub.x Al.sub.y Ti.sup.3+.sub.x-y Ti.sup.4+.sub.8-x O.sub.16 is changed reversibly to a compound of a monoclinic crystal structure in a reduced state by a reducing treatment at a temperature within a range from 600.degree..degree.C. to 1000.degree. C. Such a compound of a monoclinic crystal structure which is in a reduced state is changed reversibly back to the compound of a monoclinic crystal structure, represented by the general formula: Na.sub.x Al.sub.y Ti.sup.3+.sub.x-y Ti.sup.4+.sub.8-x O.sub.16 by applying heat treatment in air at a temperature within a range from 1200.degree. C.

Abstract: A process for producing aluminum hydroxide including the steps of:(a) dissolving colorant-containing aluminum hydroxide for forming a solution;(b) treating the solution for collecting colorant into solid phase material;(c) separating the solid phase material from the solution; and(d) precipitating aluminum hydroxide of improved whiteness from the solution.

Abstract: A process is described for producing crystalline copper aluminum borate by forming an aqueous composition comprising a volatile organic liquid having at least partial miscibility with water, a source of copper(II) ions, a source of alumina, and a source of boria at a pH in range from about 4 to about 12 to form a homogeneous gel, drying the gel to form a superficially dry solid, and calcining the dry solid at a sufficiently high temperature to form crystalline copper aluminum borate. Also described is a method for producing a copper aluminum borate precursor which when dried and/or calcined to a sufficiently high temperature forms crystalline copper aluminum borate.

Abstract: A crystalline zeolite SSZ-26 is prepared using a hexamethyl [4.3.3.0] propellane-8,11-diammonium cation as a template. Also disclosed is a process for converting hydrocarbons with crystalline zeolite SSZ-26.

Abstract: Disclosed is a method for producing hydrotalcite in high yield including reacting activated magnesia with an aqueous solution containing aluminate, carbonate, and hydroxyl ions. The method further includes a first step of heating magnesium carbonate or magnesium hydroxide to a temperature between about 500.degree.-900.degree. C. to form activated magnesia or magnesium oxide. The method is suited to producing synthetic hydrotalcite from industrial Bayer liquor.

Abstract: A method for synthesizing a crystalline silicophosphoaluminate is provided. The composition has ion-exchange properties and is readily convertible to catalytically active material. The synthesis method requires an organic phase, and an aqueous phase. The silicon, phosphorus and aluminum components of the silicophosphoaluminate may, optionally, be replaced with other elements in the plus 4, 5 and 3 valence states, respectively.

Abstract: A composite ceramic material having improved properties is disclosed as well as several methods for preparing the same. The composite powder is substantially comprised of zirconia and spinel phases, produced by precipitation and calcination of the precipitate of the oxide forming precursor salts. A preferred method for introducing the zirconium is as a soluble and/or decomposable salt during precipitation of the spinel forming hydroxyl or halo hydroxyl spinel forming salts. The zirconium salt decomposes to zirconia during calcining and/or sintering of the powder resulting from the precipitation. A preferred composite is that obtained from magnesium and aluminum salts, resulting in a MgAl.sub.2 O.sub.4 spinel and intimately admixed ZrO.sub.2 which contains a stabilizing agent.

Abstract: Ceramic translucent material mainly comprising densely sintered polycrystalline yttrium aluminum garnet in which between 20 and 1500 ppm by weight of ZrO.sub.2 is added to the yttrium aluminum garnet. When manufacturing an article of such a ceramic translucent material, a thermal treatment is carried out at a temperature of more than 1400.degree. C. in an oxidizing atmosphere after sintering.

Abstract: An optoelectronic signal recording and storage medium including a base layer, a conductive layer, a photoconductive layer and storage layer has a coherent crystal morphology throughout, even though the chemical and electrical properties of its layers are by choice dramatically different. The base layer is preferably made of monocrystalline sapphire grown in a manner as to allow the growth of the other layers directly on a surface of the base layer without the need to grind and polish that surface, thereby minimizing internal defects in the medium. The monocrystalline base layer also allows the acceptance of exeptionally uniformly distributed charges over wide areas of the medium, thereby enabling the medium to locally record and store minutely differing optoelectronic signals on a background of minimal noise, thus facilitating low light level electronic or optical recording and long term storage of signals and minimal energy readout of those stored signals.

Abstract: Process for the manufacture of vitreous metal oxides in which a metal alcoholate derived from an alcohol, the pka of which is less than 15.74, is hydrolysed with an aqueous medium, the pH of which is greater than 1.5. The process is applied especially to the manufacture of vitreous zirconium oxide.

Abstract: The stabilization of zirconia when used as a ceramic by various stabilizers has been known but a new and improved stabilized particulate zirconia has now been developed showing the important advantages.The particulate zirconia now developed is coated with a hydrous oxide of titanium and/or of aluminium and with at least one hydrous oxide of yttrium, calcium, magnesium, strontium or cerium.

Abstract: A water-insoluble pigment comprising a complex of an anion exchange material with a layered crystal structure and a water-soluble dye is disclosed. The anion exchange material may be represented by the general formula[M.sup.+2 Q.sup.+3 (OH).sub.5-x ](A.sup.-1).sub.d (A.sup.-2).sub.e (A.sup.-3).sub.f (A.sup.-4).sub.g.nH.sub.2 Owhere M is a metal element or elements each with a positive valence of 2; Q is a metal element or elements each with a positive valence of 3; A.sup.-1, A.sup.-2, A.sup.-3, and A.sup.-4 are each one or more exchangeable anions each having a negative valence of 1, 2, 3, and 4, respectively; and n, x, d, e, f and g are real numbers greater than or equal to zero and satisfy the following:0<x.ltoreq.1d+2e+3f+4g=x0.ltoreq.n.ltoreq.

Abstract: Zeolite EU-2 having a molar composition expressed by the formula:0.5 to 1.5 R.sub.2 O: Y.sub.2 O.sub.3 : at least 70 XO.sub.2 : 0 to 100 H.sub.2 Owherein R is a monovalent cation or 1/n of a cation of valency n, X is silicon and/or germanium, Y is one or more of aluminium, iron, gallium or boron, and H.sub.2 O is water of hydration additional to water notionally present when R is H, and having an X-ray pattern substantially as set out in Table 1 is prepared from a reaction mixture containing XO.sub.2 (preferably silica), Y.sub.2 O.sub.3 (preferably alumina) and a dicationic alkylated polymethylene diamine. The zeolite is useful in catalytic processes, especially for the conversion of methanol to hydrocarbons.

Abstract: A liquor of the Bayer process, as defined, is contacted with manganese dioxide to oxidize organic material in the liquor. When the liquor is the seed wash liquor, oxalates in particular are oxidized.

Abstract: Procedure for making Al.sub.2 O.sub.3 spheroids, 600 micrometers in diameter or less, utilizes an AlOOH sol containing 0.25% weight percent MgO (in the form of Mg(NO.sub.3).sub.2 .multidot.6H.sub.2 O) and HNO.sub.3. The sol is dispersed into droplets in a particle forming fluid (e.g., 2-ethylhexanol) where gelling occurs. The gelled spheroids are collected, dried and pre-fired in air at temperatures less than 1,200.degree. C. for up to about 12 hours. The dried and prefired beads are fired in a 2-step process at temperatures of about 1,850-1,950.degree. C. in the following sequence:a first dry oxygen firing for about ten minutes, followed by a wet hydrogen firing for up to 350 minutes. Reasonably transparent microspheres having crystallites in the range of 5-100 micrometers are obtained with little intergranular porosity, and their density is estimated to be near theoretical.

Abstract: Ceramic oxide diphasic xerogels of structurally dissimilar phases (crystalline and amorphous, semicrystalline or noncrystalline) but compositionally similar phases will be converted to crystalline ceramic oxide products having enhanced densification when subjected to substantially lower sintering temperature.

Abstract: Finely divided, acicular and pore-free .alpha.-Fe.sub.2 O.sub.3 is prepared from iron(III) salts in the presence of one or more organic substances which form complexes with iron(III) ions, in alkaline suspension, at from 80.degree. to 250.degree. C.

Abstract: Disclosed is making a particular inorganic crystalline vanadium III oxidic compound from a pentavalent vanadium compound and at least one other or more metal cations, which process comprises (1) reducing a pentavalent vanadium oxidic compound to the V.sup.III state by heating at 100.degree. C. or less an aqueous medium slurry or solution of said pentavalent compound containing a reducing agent selected from hydrazine and hydrocarbylhydrazine, (2) providing in said aqueous medium, either before, during or after said reducing step, said other metal cation(s) in solution in the ratio called for by said particular crystalline compound, (3) removing the liquid aqueous medium, and (4) calcining the resulting dry solid at a temperature in the range from 400.degree. to 800.degree. C. in an inert atmosphere.Also disclosed is the vapor phase catalytic dehydrogenation of paraffins using certain spinels and perovskites as catalysts.

Abstract: A process for producing acidic boratozirconium chloride sols which comprises: reacting a zirconium compound with a boron compound in molar ratios of B/Zr of 0.3-1.2 together with a compound of a metal M other than boron, the metal M being selected from the group consisting of divalent, trivalent, tetravalent and pentavalent metals in molar ratios of M/Zr of about 0.01-1 in water in the presence of chloride ions in molar ratios of Cl/Zr of not less than about 1.The acidic boratozirconium chloride sol may be converted to basic boratozirconium sols by reacting the acidic sol with a basic carbonate compound such as ammonium carbonate.The sols, either acidic or basic, are readily gelled by contact with a dehydration solvent such as methanol or acetone.The gel is calcined at relatively low temperatures to provide zirconia which is either very pure or stabilized in varied degrees.

Abstract: According to the invention a powder of lead-containing oxides and a process for preparing the same for the production of an element for electrical and other applications are provided. The powder is prepared by mixing and calcining a powder of oxides of metals other than lead, lead-containing oxides, metal substances forming the oxides upon calcination or mixtures thereof, adding and mixing a powder of a lead substance to obtain a mixture and then calcining the mixture. The powder includes a Perovskite type lead-containing oxides of the formula of ABO.sub.3 wherein A is a metal element coordinated with 12 oxygen atoms and containing at least lead, and B is a metal element coordinated with 6 oxygen atoms. A phase containing the lead forms a skin layer of the powder.

Abstract: A metal alcoholate is treated with a quantity of water such that the molar ratio of the quantity of water to the quantity of metal alcoholate is lower than the valency of the metal in the alcoholate.

Abstract: Seeding of beta type alumina compositions in which the alumina in the raw batch is microcrystalline boehmite results in significant increase in hardness, density and strength, as compared to unseeded beta alumina, when fired under similar conditions.

Abstract: A method for growing crystals of sodium beta" alumina is described. The crystals are grown by Czochralski type processes or analogous methods wherein single crystals are formed from a flux or melt. The melt is a eutectic type liquid primarily containing Na or K, (Li, Mg or other divalent element, e.g. Ni.sup.2+, Co.sup.2+, Cr.sup.2+, Fe.sup.2+, etc.) Al, in proportions to produce beta" alumina. To lower the melt temperature to where e.g. Na.sub.2 MgAl.sub.10 O.sub.17 beta" or Na.sub.2 Li.sub.1/2 Al.sub.11/2.degree.17 beta" can crystallize in its stability region (approximately less than 1700.degree. C. for the Mg version and approximately less than 1600.degree. C. for the Li version) high valent ions, which do not enter the structure, particularly V.sup.5+, Nb.sup.5+, Ta.sup.5+, Zr.sup.4+ and/or Hf.sup.4+ are added to the melt. The method has allowed the growth of single crystals of the Li-stabilized sodium and potassium varieties for the first time.

Abstract: A water-insoluble pigment comprising a complex of a water-insoluble inorganic substrate exhibiting anion exchange properties, a water-soluble dye, and an anionic amphipathic material is disclosed.

Abstract: A process for the production of a sinterable raw material powder to be used for the production of a partially stabilized ZrO.sub.2 sintered body or ceramic body containing 0 to 60 parts of alumina, and the process for the production of the sintered body or ceramic body using this powder.

Abstract: A water-insoluble pigment comprising a complex of an inorganic water-insoluble anion exchange material and a water-soluble dye is disclosed. The anion exchange material may be represented by the general formula:[M.sub.1-x.sup.a Q.sub.x.sup.a+1 O.sub.y (OH).sub.z ](A.sup.-1).sub.d (A.sup.-2).sub.e (A.sup.-3).sub.f (A.sup.-4).sub.g.nH.sub.2 Owherein M is a metal element or elements each with a positive valence of a; Q is a metal element or elements each with a positive valence of a+1; a is 2, 3, 4 or 5; A.sup.-1, A.sup.-2, A.sup.-3, and A.sup.-4 are each one or more exchangeable anions each having a negative valence of 1, 2, 3 and 4, respectively; x is 0<x.ltoreq.0.5; and n, y, z, d, e, f, and g are real numbers greater than or equal to zero and satisfy the following:2y+z=a0<d+2e+3f+4g.ltoreq.x0.ltoreq.n.ltoreq.10provided that when y=0, a is not equal to 2.

Abstract: A water-insoluble pigment comprising a complex of an anion exchange material with a layered crystal structure and a water-soluble dye is disclosed. The anion exchange material may be represented by the general formula:[M.sub.x.sup.+1 Q.sub.y.sup.+2.Al(OH).sub.3 ](A.sup.-1).sub.d (A.sup.-2).sub.e (A.sup.-3).sub.f (A.sup.-4).sub.g.nH.sub.2 Owhere M is a metal element or elements each with a positive valence of 1; Q is a metal element or elements each with a positive valence of 2; A.sup.-1, A.sup.-2, A.sup.-3, and A.sup.-4 are each one or more exchangeable anions each having a negative valence of 1, 2, 3, and 4 respectively; and n, x, y, d, e, f, and g are real numbers greater than or equal to zero and satisfy the following:0<x+2y.ltoreq.1d+2e+3f+4g=x+2y0.ltoreq.n.ltoreq.

Abstract: The present invention relates to a novel silver aluminum borate composition useful as a catalyst for oxidation and/or ammoxidation reactions. More particularly the invention is directed to silver aluminum borate having the general formula (x) Ag.sub.2 O.(y) Al.sub.2 O.sub.3.(z) B.sub.2 O.sub.3 where x, y and z are numbers representing molar amounts of the oxides such that the mole fraction of Ag.sub.2 O, calculated as x/(x+y+z) is from about 0.35 to about 0.60, the mole fraction of Al.sub.2 O.sub.3, calculated as y/(x+y+z) is from about 0.10 to about 0.40, and the mole fraction of B.sub.2 O.sub.3, calculated as z/(x+y+z) is from about 0.10 to about 0.45. The invention is further directed to a method for preparing the catalyst, and to its use as an oxidation or ammoxidation catalyst.

Abstract: Homogeneous, nonporous ceramic fibers containing at least one magnetically-unaligned, microcrystaline transition metal oxide spinel phase. The ceramic fibers may be used in polymeric, ceramic and metallic composites. Said ceramic spinel is produced by dispersing soluble inorganic and transition metal compounds in an aqueous mixture, concentrating to produce a viscous concentrate, shaping into the desired article, gelling the shaped article, and heating to produce the transition metal spinel article. Beads, bubbles, flakes, microspheres, films and granules may be made as well as fibers.

Abstract: An improved process for fabricating barium calcium aluminum impregnants for dispenser cathodes is described. The resulting cathodes have improved lifetimes and reliability through the use of organometallic starting materials in the impregnant process.

Abstract: Ultrafine particles of ceramic or metallic material are obtained at low temperatures from a nitrate source capable of endothermic decomposition by molecularly combining under a nitrogen atmosphere the nitrate source with an inorganic reducing fuel compound, such as hydrazine, to provide a chemical precursor for the ceramic or metallic material and then exothermically decomposing the precursor in a controlled atmosphere by heating to a temperature up to about 200.degree. C. below the endothermic decomposition temperature of the nitrate source. The nitrate source is a metal nitrate or a mixture of nitrate salts. Ferrite particles are recovered when the nitrate source is a mixture of nitrate salts containing ferric nitrate in a 2:1 molar ratio with at least one additional metal nitrate.

Abstract: A method of producing layered structures of metal hydroxides (one or more metals) free of chloride or chlorine is disclosed. A specific ratio layered structure hydroxide is obtained from mixing first and second metals (respectively in the form of hydroxide, oxyhydroxide carbonate or nitrate as to the first metal and a hydroxide or alkali metal oxide as to the second) in proportions yielding a precipitated layered structure. The precipitators metal hydroxides with any excess of metal over 1:1 forming a segregated phase. Processing involves mixing, maintaining as a suspension up to about 48 hours at temperatures above about 40.degree. C. followed by cooling to recover the precipitate.

Abstract: Disclosed is making an inorganic crystalline vanadium III oxidic compound from a pentavalent vanadium compound, which process comprises (1) reducing a pentavalent vanadium oxidic compound to substantially the V.sup.III state by heating at 100.degree. C. or less an aqueous medium slurry or solution of said pentavalent compound containing a reducing agent selected from hydrazine and hydrocarbylhydrazine, (2) providing in said aqueous medium, either before, during or after said reducing step, other metal cations in solution in the ratio called for by the desired crystalline compound, (3) removing the liquid aqueous medium, and (4) calcining the resulting dry solid at a temperature in the range from 400.degree. to 800.degree. C. in an inert atmosphere.Also disclosed is the vapor phase catalytic dehydrogenation of paraffins using certain spinels and perovskites as catalysts.

Abstract: A method of stabilizing an aqueous solution of alkali metal aluminate comprises admixing an aqueous solution of alkali metal aluminate having a pH of at least 10 with a sufficient amount of carboxylate-containing vinyl polymer to form a solution containing fron 0.1 to 2.0 weight percent of an anionic vinyl polymer based on alkali metal aluminate solids, and a stabilized aqueous alkali metal aluminate solution.

Abstract: A method of making beta"-alumina comprises dispersing in a precursor of aluminum oxide a member of the group comprising sodium oxide and its precursors, and dispersing in the precursor of aluminum oxide a spinel stabilizer which is a member of the group comprising spinel-forming oxides and the precursors thereof, to form a mixture. The mixture is then heated to a temperature at which at least some of the precursor of aluminum oxide is converted to beta"-alumina. The precursor of aluminum oxide is one which, when calcined in air by itself, has a calcination product which, when subjected to X-ray diffraction, displays a predetermined X-ray diffraction trace. The X-ray diffraction trace is one whose peak with the highest intensity in the 2 (theta) range of 44.degree.-48.degree. and whose peak with the highest intensity in the 2 (theta) range of 63.degree.-69.degree. respectively have maximum intensities and integrated intensities which comply with equations (I) and (II):A/S is greater than 0.

Abstract: Efficient, regenerable sorbents for removal of H.sub.2 S from high temperature gas streams comprise porous, high surface area particles. A first class of sorbents comprise a thin film of binary oxides that form a eutectic at the temperature of the gas stream coated onto a porous, high surface area refractory support. The binary oxides are a mixture of a Group VB or VIB metal oxide with a Group IB, IIB or VIII metal oxide such as a film of V-Zn-O, V-Cu-O, Cu-Mo-O, Zn-Mo-O or Fe-Mo-O coated on an alumina support. A second class of sorbents consist of particles of unsupported mixed oxides in the form of highly dispersed solid solutions of solid compounds characterized by small crystallite size, high porosity and relatively high surface area. The mixed oxide sorbents contain one Group IB, IIB or VIIB metal oxide such as copper, zinc or manganese and one or more oxides of Groups IIIA, VIB or VII such as aluminum, iron or molybdenum.

Abstract: The process of producing high surface area mixed metal oxides comprising selecting a precursor characterized by the following formula:A.sub.x M.sub.a [M'(CN).sub.c ].sub.b.nH.sub.2 Ox=0-4;a=0-4;b=0.1-4;c=4-8;n=0-30;A=alkali, alkaline earth metal, Al, Si or mixtures;M=rare earth metals, transition metals or mixture thereof; andM'=transition metal capable of forming a cyanide (e.g. Group VIA-VIII A) or mixture thereof,and heating the precursor at a temperature rate of below 1.degree.C/minute in a controlled atmosphere consisting essentially of O.sub.2 and an inert gas to a temperature sufficient to decompose the precursor and produce the mixed metal oxide.

Abstract: The invention comprises high purity substantially spherical metal oxide particles having one or more predominant particle sizes formed from one or more metal alkoxides. In one embodiment there is disclosed multimodal particle size distributions of such substantially spherical metal hydroxide particles while a second embodiment describes the formation of such particles using more than one metal alkoxide to form either a mixed metal hydroxide particle or a layered particle comprising a core of a first metal hydroxide and at least one layer of an additional metal hydroxide.

Abstract: The iron content of Bayer process streams is reduced by contacting said stream with a tertiary hydroxyl-containing polyamine.

Abstract: A method for producing .gamma.-form lithium aluminate powders usable as a material for an electrolyte tile of molten carbonate fuel cells which comprises mixing aluminum alkoxide with one member selected from the group consisting of the lithium salts of inorganic and organic acids, lithium hydroxide and lithium oxide in the presence of a non-aqueous solvent, carrying out reaction with addition of water of 1.5 to 20 moles (including water of crystallization contained in the lithium compound) based on 1 mole of aluminum alkoxide with stirring, and removing the solvent to obtain a solid matter which is then calcined at a temperature in a range of from 650.degree. C. to 1000.degree. C.

Abstract: The invention comprises a process for the production of high purity substantially spherical metal oxide particles using seed nuclei without introducing impurities into the desired product which comprises forming a metal alkoxide vapor; reacting the vapor with a non-reactive gas containing sufficient water vapor to hydrolyze a portion of the metal alkoxide vapor to form solid seed nuclei of metal hydroxide; cooling the remaining metal alkoxide vapor containing the metal hydroxide seed nuclei sufficiently to form an aerosol comprising finely divided metal alkoxide liquid condensed on the solid metal hydroxide seed nuclei; hydrolyzing the metal alkoxide aerosol by contact with water vapor to hydrolyze the metal alkoxide liquid to form substantially spherical metal hydroxide particles; and calcining the substantially spherical metal hydroxide particles to form the corresponding metal oxide.

Abstract: A system is disclosed for the purification of a caustic solution to remove impurities therefrom comprises: bringing the caustic solution into contact under pressure with the outside of a plurality of porous hollow fibers each having at least one open end and coated with a semipermeable membrane and collecting purified solution from the open ends of the hollow fibers. In a preferred embodiment, the filtering medium comprises porous hollow polysulfone fibers coated with a semipermeable sulfonated polysulfone membrane.

Abstract: Alumina-zirconia ceramic powders comprise from 10% to 25% by weight of zirconium oxide having specific crystalline phases and from 75% to 90% by weight of aluminum oxide having specific crystalline phases, and have an average particle size of no more than 1,000 .ANG.ngstroms and a two-phase structure wherein the zirconium oxide phase is dispersed in the aluminum oxide phase. A method of making such alumina-zirconia ceramic powders comprises the steps of suspending composite powders having a specific chemical composition and a specific average particle size in water to form a slurry, freeze-drying the slurry, and calcining the freeze-dried powder at atmospheric pressure in air at a temperature of from 800.degree. C. to 1,250.degree. C.

Abstract: Beta double prime alumina is provided having a sensible amount of at least one polyvalent cationic species intercalated therein. In accordance with a preferred embodiment, such beta double prime alumina is provided having trivalent and/or tetravalent cationic species intercalated therein, especially species derived from the lanthanide and actinide series of elements. Certain of the foregoing materials exhibit phosphorescence or fluorescence, and some are believed to be capable of producing laser emission upon suitable irradiation.Methods for modifying beta double prime aluminas comprising contacting crystals of the aluminas with polyvalent cation-containing salts such as in the molten state or in the gaseous state are also provided. Laser and other optical devies are disclosed employing the modified beta double prime aluminas of this invention.

Abstract: A novel composition including an inorganic mixed metal oxides and partially hydrated oxides exhibiting anion exchange properties and a method of preparing the exchanger composition by coprecipitating hydroxides or hydrated oxides of a pair of metal elements such as aluminum and titanium, drying the mixed metal hydroxides or hydrated oxides, exchanging the anion of the mixed metal hydroxide or hydrated oxide for a nonvolatile anion such as a sulfate anion and calcining the mixed metal hydroxide or hydrated oxide to form a mixed metal oxide or partially hydrated oxide exhibiting anion exchange properties.

Abstract: Novel process for the production of magaldrate by the reaction of active aluminum hydroxide with a water soluble, sulfate containing compound and active magnesium oxide and/or magnesium hydroxide in stoichiometric quantities in the presence of water.

Abstract: Cesium is recovered from cesium alum, CsAl(SO.sub.4).sub.2, by a two-reaction sequence in which the cesium alum is first dissolved in an aqueous hydroxide solution to form cesium alum hydroxide, CsAl(OH).sub.3, and potassium sulfate, K.sub.2 SO.sub.4. Part of the K.sub.2 SO.sub.4 precipitates and is separated from the supernatant solution. In the second reaction, a water-soluble permanganate, such as potassium permanganate, KMnO.sub.4, is added to the supernatant. This reaction forms a precipitate of cesium permanganate, CsMnO.sub.4. This precipitate may be separated from the residual solution to obtain cesium permanganate of high purity, which can be sold as a product or converted into other cesium compounds.