Abstract: A powder of solid and spherical glass particles is easily manufactured by subjecting a mixed solution of a raw material oxide powder comprising a glass network-forming element, and an aqueous solution of a water-soluble compound comprising a glass-forming element other than the element of the raw material oxide powder to spray-thermal decomposition, wherein the spray-thermal decomposition temperature is set to be in a specific range according to the amount of the raw material oxide powder in the total of the amount of the raw material oxide powder and the oxide-converted amount of the water-soluble compound, as well as the average particle size of the glass powder to be manufactured.

Abstract: A method for making a raw ceramic powder includes the steps of mixing and pulverizing a basic powder, a first organic metal compound containing a metallic element for modifying the electrical characteristics of the basic powder, a second organic metal compound containing a metallic element for improving the sinterability of the basic powder, and an organic solvent, to form a slurry, the first organic metal compound and the second organic metal compound being soluble in the organic solvent; removing the organic solvent from the slurry to obtain the basic powder, the surfaces of the particles of the basic powder being coated with the first organic metal compound and the second organic metal compound; and heat-treating the basic powder at a temperature higher than the decomposition temperature of the first organic metal compound and lower than the decomposition temperature of the second organic metal compound.

Abstract: A method for making a raw ceramic powder includes the steps of mixing and pulverizing a basic powder, a first organic metal compound containing a metallic element for modifying the electrical characteristics of the basic powder, a second organic metal compound containing a metallic element for improving the sinterability of the basic powder, and an organic solvent, to form a slurry, the first organic metal compound and the second organic metal compound being soluble in the organic solvent; removing the organic solvent from the slurry to obtain the basic powder, the surfaces of the particles of the basic powder being coated with the first organic metal compound and the second organic metal compound; and heat-treating the basic powder at a temperature higher than the decomposition temperature of the first organic metal compound and lower than the decomposition temperature of the second organic metal compound.

Abstract: A powder of solid and spherical glass particles is easily manufactured by subjecting a mixed solution of a raw material oxide powder comprising a glass network-forming element, and an aqueous solution of a water-soluble compound comprising a glass-forming element other than the element of the raw material oxide powder to spray-thermal decomposition, wherein the spray-thermal decomposition temperature is set to be in a specific range according to the amount of the raw material oxide powder in the total of the amount of the raw material oxide powder and the oxide-converted amount of the water-soluble compound, as well as the average particle size of the glass powder to be manufactured.

Abstract: A titanium compound for photochemical reactions having a high catalytic activity per unit surface area and extremely good stability to heat treatment is made of a substitutional solid solution of titanium oxide in which aluminum atoms occupy titanium sites of the titanium oxide uniformly at a predetermined ratio. Aluminum atoms preferably occupy about 0.01 to 0.5% of the titanium sites. The titanium compound for photochemical reactions is obtained from a complex alkoxide of titanium and aluminum.

Abstract: A powder of magnetic oxides given by the general formula:MeFe.sub.2 O.sub.4where Me is at least one element of divalent metal element selected from the group consisting of Ni, Zn, Cu, Mn and Co, is produced by a method comprising the steps of preparing a magnetic oxide precursor composed of .alpha.-FeOOH and a complex carbonate compound of at least one divalent metal element deposited on surfaces of particles of .alpha.-FeOOH; and then treating the resultant magnetic oxide precursor with heat.

Abstract: Powder of ceramic materials is produced by mixing a powder of a basic ceramic composition, a solvent and a surfactant to prepare a slurry, adding at least one unsaturated fatty acid salt containing an additive metal element to the resultant slurry, polymerizing the at least one unsaturated fatty acid salt with a polymerization initiator to form a polymer of at least one unsaturated fatty acid salt, drying the resultant slurry to form a layer of the resultant polymer on particle surfaces of the basic ceramic composition, and then calcining the resultant coated powder of the basic ceramic composition.

Abstract: Powder of dielectric ceramic materials is produced by preparing a main component Ba(Ti.sub.1-x-y Zr.sub.x Hf.sub.y)O.sub.3 allowing barium hydroxide, at least one titanium compound, at least one zirconium compound and at least one hafnium compound to react with one another by condensation by catalytic actions of a base selected from the group consisting of alkali and amines; preparing a complex hydroxide of at least one rare earth element and manganese by allowing at least one rare earth element compound and a manganese compound to react with a base selected from the group consisting of alkali and amines in an aqueous solution; preparing at least one carbonate of calcium and magnesium by allowing at least one compound of calcium compounds and magnesium compounds to react with carbonate ions in an aqueous solution; mixing all the precipitates, and drying and thermally treating the resultant mixture.

Abstract: A process for preparing a powdered ceramic raw material, comprising the steps of; (a) adding gaseous carbon dioxide or a precipitant composed of a water-soluble carbonate to the first aqueous solution containing at least one nitrate or chloride of elements selected from the group consisting of Ba, Sr, Ca and Mg until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate at least one carbonate of said elements, (b) adding ammonia gas or a precipitant composed of an aqueous solution of a water-soluble hydroxide to the second aqueous solution of at least one nitrate or choride of elements selected from the group consisting of Ti, Zr and Sn until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate at least one hydroxide of said elements, (c) adding ammonia gas or a precipitant composed of an aqueous solution of a water-soluble hydroxide to the third aqueous solution of lead acetate or lead nitrate until the pH of the

Abstract: A process for preparing a powdered ceramic raw material comprises the steps of(a) adding ammonia gas or an alkali to a first aqueous solution containing a water-soluble salt of lead capable of being precipitated as a hydroxide until the pH of the first solution reaches a value within the range of 9 to 10 to form a precipitate of lead hydroxide;(b) adding ammonia gas or alkali to a second aqueous solution containing at least one water-soluble salt or ceramic components other than lead capable of being precipitated as a hydroxide until the pH of the second solution reaches a value within the range of 9 to 10 to form a precipitate of hydroxide of said ceramic components;(c) mixing the resulting reaction mixtures, followed by separation of the precipitates of hydroxides from solution, washing with water and drying; and(d) calcining the precipitate to form complex oxides of said ceramic material.

Abstract: A process for preparing a particulate ceramic material comprising the steps of:(a) adding carbon dioxide or an aqueous solution of a soluble carbonate to first aqueous solution of a nitrate or chloride of Ba, Sr, Ca or Mg in a first vessel to adjust the pH of said first aqueous solution to between 7 and 10 thereby forming a carbonate precipitate;(b) adding an aqueous solution of a soluble hydroxide to a second aqueous solution of a nitrate or chloride of Ti, Zr, Sn or Pb in a second vessel to adjust the pH of said second aqueous solution to between 7 and 10 thereby forming a hydroxide precipitate;(c) combining slurries containing the precipitates formed in said first and second vessels;(d) mixing the combined slurries;(e) passing the slurries through a filter;(f) washing the filter cake with water;(g) drying the filter cake to form a powder;(h) calcining the dried powder; and(i) grinding the calcined powder.

Abstract: A humidity sensitive resistor, comprising a pair of detecting electrodes (2) and (3) formed on an insulating substrate (1), and a humidity sensitive film (4) formed to coat on this detecting electrodes, the humidity sensitive film (4) being made of an integrated structure of a first layer macromolecular resin film (5) containing a polyvinyl alcohol polymer and an electrolyte and a second layer of hygroscopic macromolecular resin film (6) covering on the surface of the first layer, and humidity being detected with the aid of a change of the resistance value of this humidity sensitive film (4).

Abstract: A humidity sensitive ceramics comprises a sintered body consisting essentially of a semiconductive compound oxide with a perovskite structure and a compound oxide, said semiconductive compound oxide having a composition expressed by the general formula (I):A.sub.1-x A'.sub.x BO.sub.3-.delta.. . . (I)wherein A is at least one element selected from the group consisting of rare earth elements with atomic numbers 57 to 71, yttrium and hafnium, A' is at least one element selected from the group consisting of alkaline-earth metals, B is at least one element selected from the group consisting of transition elements with atomic numbers 23 to 30, x is a mole fraction and takes a value of the following range, 0.ltoreq.x.ltoreq.1, and .delta. is a non-stoichiometric parameter, said compound oxide having a composition expressed by the general formula (II):AMO.sub.3 . . .

Abstract: A humidity sensitive device comprises a base body of a preferably porous semiconductive ceramic having a grain boundary. A high resistance layer is formed in the grain boundary of the semiconductive ceramic and exhibits a humidity sensitive characteristic. First and second electrodes for withdrawing an electrical signal are formed spaced from each other on at least one major surface of the semiconductive ceramic base.

Abstract: A humidity sensitive device, including opposing electrodes formed on an insulating substrate, and a humidity sensitive film formed on the surface of the insulating substrate and at least between the opposing electrodes. The humidity sensitive film is obtained by coating on the surface of the insulating substrate a uniformly dispersed mixture including zirconium oxychloride and epoxy resin and heating the same.