Abstract: A structural ceramic material comprising single phase polycrystalline cubic aluminum oxynitride preferably with at least 97% of theoretical density which displays transparency and isotropic optical, thermal and electrical properties, an infrared cutoff at about 5.2 microns wavelength, and which shows no chemical or physical property change after heating in air (atmosphere) at 1100.degree. C.

Abstract: In the manufacture of iron oxide flakes by the steps of mixing an aqueous ferric salt solution with an aqueous alkali solution for thereby inducing an amorphous precipitate and subjecting the precipitate to a hydrothermal treatment, iron oxide flakes of an increased flake size are obtained by adding boric acid or a salt thereof to the mixture prior to the step of hydrothermal treatment.

Abstract: When sulfate ions and a solution of monocalcium phosphate are reacted under conditions which result in the formation of a slurry comprising calcium sulfate hemihydrate and phosphoric acid of about 35% to about 55% P.sub.2 O.sub.5, filtration is improved when a sulfonic acid, a sulfonic acid salt, tall oil fatty acid or alkoxylated or esterified tall oil fatty acid and mixtures thereof is present in the slurry (preferably at 1-1000 ppm). Preferably a two vessel reaction system is used in which the reaction slurry undergoes intra- and inter- vessel circulation (preferably through a draft tube). The solution portion of the slurry in the first vessel (the "dissolver") is preferably maintained at a negative sulfate concentration (i.e. excess Ca.sup.+2) and the solution in the second vessel (the "crystallizer") is preferably maintained at a positive sulfate ion concentration, most preferably at a reduced pressure, (e.g. to provide evaporative cooling).

Abstract: A sodium perborate (NaBO.sub.2, H.sub.2 O.sub.2, 3H.sub.2 O) product having approximately spherical particles of size between about 250 and 600 microns, a bulk density between about 0.75 and 1.05 Kg./liter and a superior resistance to abrasion and impact, is prepared by a method comprising crystallization from a supersaturated aqueous solution of sodium perborate in the presence of an anionic surfactant and in the absence of alkaline metal silicates.

Abstract: Stabilized zirconia for oxygen ion-conductive solid electrolyte, containing scandium oxide and ytterbium oxide having the following formula:.alpha.ZrO.sub.2..beta.Sc.sub.2 O.sub.3..gamma.Yb.sub.2 O.sub.3wherein .alpha., .beta., .gamma. are molar fractions; and .alpha.+.beta.+.gamma.=1.

Abstract: Single crystalline, acicular ferric oxide particles are produced by maintaining an aqueous suspension of ferric hydroxide at an elevated temperature at an alkaline pH in the presence of an organic phosphonic acid compound or a hydroxycarboxylic acid compound as a growth-regulating agent.

Abstract: A coated, rounded, solid calcium hypochlorite granule is described which is comprised of granular calcium hypochlorite encapsulated with a plurality of layers of an inorganic salt other than calcium hypochlorite. The inorganic salt is admixed with sufficient alkaline material to form a coating which has a pH in dilute aqueous solution at ambient temperature of at least about nine or higher. The inorganic salt is selected from a group consisting of the chloride, chlorate, nitrate, bromide, bromate and sulfate of an alkali metal. The alkaline material is selected from the group consisting of calcium hydroxide, strontium hydroxide, barium hydroxide, magnesium hydroxide and mixtures thereof. The inorganic salt coating comprises from about 4 to about 45 percent by weight of the calcium hypochlorite granule. The coated, rounded, solid granule of this invention is highly stable and resists chemical decomposition and dusting during storage.

Abstract: Phosphate rock and sulfuric acid are reacted under conditions which result in the formation of calcium sulfate hemihydrate and phosphoric acid of about 35% to about 55% P.sub.2 O.sub.5. A two vessel reaction system is used in which the reaction slurry undergoes intra- and inter- vessel circulation (preferably through a draft tube). The solution portion of the slurry in the first vessel (the "dissolver") is preferably maintained at a negative sulfate concentration (i.e. excess Ca.sup.+2) and the solution in the second vessel (the "crystallizer") is preferably maintained at a positive sulfate ion concentration. Also preferred is that the second vessel be maintained at a reduced pressure, (e.g. to provide evaporation cooling). Better filtration rates can thus be obtained due to the favorable shape, dominant size and size distribution of the hemihydrate crystals. Most preferred is that a crystal modifier (e.g.

Abstract: By the process of the invention a unique crystalline calcium sulfate dihydrate product is precipitated from an aqueous solution of calcium sulfate and a combination of molecularly dehydrated inorganic phosphates. Also within the scope of the invention is a wallboard manufacturing process and a gypsum wallboard which comprises the gypsum of the invention.

Abstract: Phosphate rock and sulfuric acid are reacted to produce phosphoric acid and calcium sulfate by means of the hemihydrate wet process. In this improved process, the calcium sulfate hemihydrate is crystallized from solution in the presence of an organic sulfonic acid or a derivative thereof. The organic sulfonic acid or its derivative improves the growth of the calcium sulfate hemihydrate crystals and thus improves the filtration rate of the slurry produced in this improved process.

Abstract: A sintered compact of boron nitride with high density form having high oxidation resistance, water resistance, compressive strength and hardness can be obtained by sintering wurtzite-structured boron nitride together with a boride of titanium, zirconium or hafnium, or with mixtures thereof under a condition of high temperature and high pressure.

Abstract: An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttriabase body consisting essentially of yttria and from about 6 to 14 mole percent lanthana.A method for preparing the transparent yttria doped with lanthana is also provided comprising admixing or co-precipitating lanthana or a precursor thereof with yttria or a precursor thereof, washing, drying and screening the mixture, calcining the admixed or co-precipitated powders, pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for from about 1/6 to 6 hours at a temperature above the H-phase transition and for from about 1/2 to 6 hours at a temperature below the H to C phase transition, said sintering being effected at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.

Abstract: Sodium Chlorite is made stable under storage conditions by (1) admixing with the sodium chlorite a stabilizing salt chemically inert to sodium chlorite and having at least one hydrate whose melting point is higher than about 50.degree. C, in amount such that said stabilizing salt can capture a quantity of water equal to at least about 5% of the weight of the sodium chlorite (NaClO.sub.2), the weight of the water in the total mixture being at least about 5% of the weight of said sodium chlorite and (2) drying the mixture sufficiently to reduce the water not captured by the stabilizing salt to an amount equal approximately to zero. Sodium chlorite thus stabilized is thermally stable and does not congeal into a solid mass even when stored in drums for several months at 50.degree. C.

Abstract: Fine-grained polygonized halide alloy bodies are formed having comparable optical properties to a single crystal halide body. Heat and force are applied to a single crystal halide to recrystallize or polygonize the halide. Room temperature grain growth observed in fine-grained pure halides is inhibited by alloying.

Abstract: A stable bleaching composition containing, as essential ingredients, an inorganic peroxide, an activating agent for said inorganic peroxide and potassium carbonate.

Abstract: Single crystals based on stabilized zirconium dioxide or hafnium dioxide, wherein used as the stabilizer is scandium oxide or an oxide of one of the rare-earth elements. The content of components in a single crystal is as follows (mol.%):______________________________________ zirconium dioxide or hafnium dioxide 70-95 stabilizer 30-5. ______________________________________The single crystals of the present invention may also contain coloring agents in an amount of 0.01 to 5% of the single crystal weight.

Abstract: Metal salts which are crystallizable from a saturated aqueous solution of the salt in the presence of a dispersion of polytetrafluoroethylene (hereinafter referred to as PTFE) resin are grown as geometrically better defined and larger crystals than those grown from an unseeded saturated solution.

Abstract: Process for producing sodium carbonate monohydrate crystals having a high bulk density, blocky crystal shape, and uniform particle size distribution from sodium carbonate solutions wherein the sodium carbonate monohydrate is crystallized in the presence of magnesium ions and sodium dodecylbenzenesulfonate.