Abstract: A method of forming a Bi-layered ferroelectric thin film on a substrate with good reproducibility, using a mixed composition of a Bi-containing organic compound and a metal polyalkoxide compound by at least one technique selected from the group consisting of molecular deposition such as CVD, and spincoat-sintering.

Abstract: A Pt compound which is in the form of a liquid at room temperature for producing Pt films usable as electrode films in semiconductor devices by the CVD method; a process for producing the compound; and a process for producing films with the use of the same.A novel compound trimethyl(ethylcyclopentadienyl)platinum (C.sub.2 H.sub.5 C.sub.5 H.sub.4)Pt(CH.sub.3).sub.3 is in the form of a liquid at room temperature and shows a sufficient vapor pressure at around 35.degree. C. Thus, it can be quantitatively supplied by gas bubbling or with the use of a liquid mass flow controller as a feedstock in the CVD method and thermally decomposed on a substrate at 150.degree. C. in a hydrogen atmosphere to give pure Pt films. This compound can be produced at a high yield by reacting iodotrimethylplatinum with sodium ethylcyclopentadienide in a solvent.

Abstract: A process, excellent in the mass productivity and economization, for purifying a niobium alkoxide or tantalum alkoxide containing Fe, Ca, Sr, Na, U, etc. as impurities to attain a purity necessitated for electronic materials or the like is provided. A niobium alkoxide or tantalum alkoxide containing the above-described impurities is dissolved in a solvent to obtain a solution, 1 to 20% of the alkoxide in the solution is hydrolyzed under stirring to form a solid reaction product, and the reaction product is separated from the unreacted alkoxide by the distillation to recover the alkoxide.

Abstract: A process for the purification of a raw gallium material to produce a purified gallium material having a higher purity than that of the raw gallium material having steps of:maintaining the raw gallium material in its melted condition within a vessel having a means, for example a tube, positioned at or near a center portion of an inside of the vessel, through which means a cooling medium is passed, andkeeping the raw gallium material in the vessel at a controlled temperature so that the purified gallium material is deposited on an outer surface of the means.

Abstract: A lamina having an excellent capacity of scattering ultraviolet rays comprising a laminar substance as a matrix and a finely divided metal or metal compound dispersed therein, wherein the difference in refractive index between the laminar substance and the finely divided metal or metal compound is not less than 0.1, and a cosmetic comprising the same as a UV screener.

Abstract: The object of the present invention is to provide a dispersion-type electroluminescence device low in current density, excellent in luminous efficiency and less in uneven luminance. For attaining this object, dented portions present in an upper part of a luminous layer of dispersion-type electroluminescence device having a back electrode layer and, laminated thereon, an insulator layer, a luminous layer and a transparent electrode layer are coated with a resin composition having a dielectric constant which is lower than that of a dielectric resin composition used for formation of the luminous layer which is 5 or higher and a transparent electrode layer is than laminated thereon.

Abstract: A process for producing an alumina-based fiber, which involves mixing an aluminum compound represented by the general formula AIR.sub.1 R.sub.2 R.sub.3 (wherein R.sub.1 R.sub.2 and R.sub.3 are each an organic group or a halogen) with water in a molar ratio of ([H.sub.2 O]/[AIR.sub.1 R.sub.2 R.sub.3 ]) of 1.10 to 1.40 to produce a polyaluminoxane, mixing the polyaluminoxane with at least one silicon-containing compound in an amount such that desired alumina-based fiber has, after calcining, a silica content of up to 70%, spinning the resulting mixture of polyaluminoxane and silicon-containing compound under an atmosphere controlled at a temperature of above 28.degree. C. and a relative humidity of above 35% to obtain precursor fiber, and then calcinating the precursor fiber to obtain an alumina-based fiber.

Abstract: A process for producing an inorganic fiber superior in stretchability, which comprises; heating either a solution of a polymetalloxane in an organic solvent, the polymetalloxane content in the solution being at least 85% by weight and the viscosity of the solution at 25.degree. C. being at least 5000 poises, or a solid state polymetalloxane to prepare a spinning liquid having a viscosity of 1 to 3000 poises; spinning the spinning liquid to form a precursor fiber; and baking the precursor fiber.

Abstract: According to the process of the present invention, trialkylarsenic compounds having a very high purity of usually over 99% can be obtained by using inexpensive, easily available arsenic oxides and without any complicated operations. The trialkylarsenic compounds thus obtained can be effectively used as a material for compound semiconductors in the field of electronic industry as well as in the field of various chemical industries, and are of great industrial value.

Abstract: A lamina having an excellent capacity of scattering ultraviolet rays comprising a laminar substance as a matrix and a finely divided metal or metal compound dispersed therein, wherein the difference in refractive index between the laminar substance and the finely divided metal or metal compound is not less than 0.1, and a cosmetic comprising the same as a UV screener.

Abstract: A method for purifying an organometallic compound in which an organometallic compound of gallium, aluminum or indium is contacted with at least one metal selected from metallic sodium, metallic potassium and a sodium-potassium alloy. This method is especially efficacious when the high-purity organometallic compound is used as a semiconductor because, by the disclosed method, the silicon components are removed as impurities, which silicon material tends to lower the electrical characteristics of the semiconductor.

Abstract: When an abrasive having an oleophilic surface used in a magnetic recording medium obtained by subjecting an inorganic powder having a Mohs hardness of 5 or above and an average particle size of 2 .mu.m across or below to a dry contact treatment with a dispersing agent having an oleophilic group under grinding conditions giving an impact value of 1G or greater is used in combination with a magnetic powder as a magnetic recording layer of magnetic recording medium, the wear at a magnetic head can be prevented and still characteristics can be improved.

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: A magnetic recording medium comprising a substrate and a magnetic layer formed on the substrate and comprising an inorganic powder having an average primary particle size of 0.35 .mu.m or less, an angle of repose of 40.degree. or more and a Mors hardness of 5 or more as a reinforcing material, and a magnetic powder, is excellent in wear resistance and durability of the magnetic layer and improves wear and injury of a magnetic head.

Abstract: High purity organometallic compounds can be obtained by the process which comprises subjecting an organometallic compound in a liquid state under stirring to preliminary oxidation or hydrolysis in a proportion of about 0.1 to 50% by weight of the organometallic compound to form solid reaction products, and separating by distillation the unreacted organometallic compound from the solid reaction products to recover the purified organometallic compound; and high purity metallic compounds such as a solid metallic hydroxide or oxide can be obtained by the process which comprises following the process as mentioned above, oxidizing or hydrolyzing completely the recovered purified organometallic compound.

Abstract: When an abrasive having an oleophilic surface used in a magnetic recording medium obtained by subjecting an inorganic powder having a Mohs hardness of 5 or above and an average particle size of 2 .mu.m across or below to a dry contact treatment with a dispersing agent having an oleophilic group under grinding conditions giving an impact value of 1 G or greater is used in combination with a magnetic powder as a magnetic recording layer of magnetic recording medium, the wear at a magnetic head can be prevented and still characteristics can be improved.

Abstract: Pigmented aluminum oxide powders are provided herein obtained by adding at least 0.5 wt. % of carbon black to aluminum oxide powder, said carbon black having a mean particle size of less than about 100 mn and a specific surface area more than 30 m.sup.2 /g, and mixing the aluminum oxide powder-carbon black composition under an impact value of more than 1 G, preferably by use of a vibration mill. The present invention also provides a method of producing said pigmented aluminum oxide powder.

Abstract: A new process for producing an inorganic fiber of superior tensile strength and modulus of elasticity, which comprises spinning a spinning solution in organic solvent of polymetaloxane of good spinnability to form a precursor fiber, calcining said precursor fiber, and wherein said solution contains polymetaloxane comprising 0.1-95 mole % of a structural unit represented by the following general formula [A] and 99.9-5 mole % of the following formula [B]: ##STR1## (wherein, M represents a trivalent or tetravalent metal atom, X.sub.1 represents an organic group which is the same as or different from ##STR2## hydrogen, nitro or halogen, X.sub.2 and X.sub.3 represent an organic group other than ##STR3## Y represents an organic group, nitro or halogen, m represents an integer from 1 to 3.).

Abstract: Powdery alumina hydrate is produced from an alkylaluminum compound by hydrolysis of the alkylaluminum compound by water through the following steps; converting the alkylaluminum compound to an ether complex compound: partially hydrolyzing the ether complex compound in the presence of an non-reactive solvent at a temperature of not higher than about 150.degree.C with stirring so that no alumina hydrate is precipitated until at least 0.8 moles of water reacts with one mole of the alkylaluminum compound, thereby forming polyaluminoxane; completely hydrolyzing the resulting polyaluminoxane at a concentration of not more than about 3.0 grams-atoms as aluminum per liter of non-reactive solvent at a temperature of about 10.degree. to about 150.degree.C with stirring, so that one mole of the feed alkylaluminum compound may be ultimately hydrolyzed completely with 2 to 10 moles of water, thereby precipitating alumina hydrate; and then separating the resulting alumina hydrate from the non-reactive solvent.