Abstract: An X-ray diffractometrically single-phase lithium titanium phosphate can be obtained by an industrially advantageous method. Provided is a method for producing the lithium titanium phosphate having a NASICON structure represented by the following general formula (1): Li1+xMx(Ti1?yAy)2?x(PO4)3 (1), and provided is a method comprising a first step of preparing a raw material mixed slurry (1) comprising, at least, titanium dioxide, phosphoric acid and a surfactant, a second step of heat treating the raw material mixed slurry (1) to obtain a raw material heat-treated slurry (2), a third step of mixing the raw material heat-treated slurry (2) with a lithium source to obtain a lithium-containing raw material heat-treated slurry (3), a fourth step of subjecting the lithium-containing raw material heat-treated slurry (3) to a spray drying treatment to obtain a reaction precursor containing, at least, Ti, P and Li, and a fifth step of firing the reaction precursor.

Abstract: A negative thermal expansion material made of zirconium phosphate tungstate containing an Al atom, and having a thermal expansion coefficient of ?2.0×10?6 to ?3.3×10?6/K. According to the present invention, a negative thermal expansion material made of zirconium phosphate tungstate having various thermal expansion coefficients, and an industrially advantageous manufacturing method thereof can be provided.

Abstract: There is provided a modified zirconium phosphate tungstate which effectively suppresses the elution of phosphorus ions even when it contacts with water, can develop the performance excellent as a negative thermal expansion material, and can be dispersed in a polymer compound such as a resin, and use of which enables a low-thermal expansive material containing a negative thermal expansion filler to be well produced. The surface of a zirconium phosphate tungstate particle is coated with an inorganic compound containing one or two or more elements (M) selected from Zn, Si, Al, Ba, Ca, Mg, Ti, V, Sn, Co, Fe and Zr. The BET specific surface area of the zirconium phosphate tungstate particle is preferably 0.1 m2/g to 50 m2/g.

Abstract: Provided is a method for producing a lithium cobalt phosphate represented by the following general formula (1):LixCo1-yMyPO4 (1), wherein 0.8?x?1.2 and 0?y?0.5, and M represents one or two or more metal elements selected from the group consisting of Mg, Zn, Cu, Fe, Cr, Mn, Ni, Al, B, Na, K, F, Cl, Br, I, Ca, Sr, Ba, Ti, Zr, Hf, Nb, Ta, Y, Yb, Si, S, Mo, W, V, Bi, Te, Pb, Ag, Cd, In, Sn, Sb, Ga, Ge, La, Ce, Nd, Sm, Eu, Tb, Dy, and Ho; the method comprising: a first step of adding an organic acid and cobalt hydroxide to a water solvent, and then adding phosphoric acid and lithium hydroxide thereto to prepare an aqueous raw material slurry (1); a second step of wet-pulverizing the aqueous raw material slurry (1) with a media mill to obtain a slurry (2) containing a pulverized product of raw materials; a third step of spray-drying the slurry (2) containing the pulverized product of raw materials to obtain a reaction precursor; and a fourth step of firing the reaction precursor.

Abstract: There is provided a modified zirconium phosphate tungstate which effectively suppresses the elution of phosphorus ions even when it contacts with water, can develop the performance excellent as a negative thermal expansion material, and can be dispersed in a polymer compound such as a resin, and use of which enables a low-thermal expansive material containing a negative thermal expansion filler to be well produced. The surface of a zirconium phosphate tungstate particle is coated with an inorganic compound containing one or two or more elements (M) selected from Zn, Si, Al, Ba, Ca, Mg, Ti, V, Sn, Co, Fe and Zr. The BET specific surface area of the zirconium phosphate tungstate particle is preferably 0.1 m2/g to 50 m2/g.

Abstract: An X-ray diffractometrically single-phase lithium titanium phosphate can be obtained by an industrially advantageous method. Provided is a method for producing the lithium titanium phosphate having a NASICON structure represented by the following general formula (1): Li1+xMx(Ti1?yAy)2?x(PO4)3 (1), and provided is a method comprising a first step of preparing a raw material mixed slurry (1) comprising, at least, titanium dioxide, phosphoric acid and a surfactant, a second step of heat treating the raw material mixed slurry (1) to obtain a raw material heat-treated slurry (2), a third step of mixing the raw material heat-treated slurry (2) with a lithium source to obtain a lithium-containing raw material heat-treated slurry (3), a fourth step of subjecting the lithium-containing raw material heat-treated slurry (3) to a spray drying treatment to obtain a reaction precursor containing, at least, Ti, P and Li, and a fifth step of firing the reaction precursor.

Abstract: Provided is a method for producing a lithium cobalt phosphate represented by the following general formula (1):LixCo1-yMyPO4 (1), wherein 0.8?x?1.2 and 0?y?0.5, and M represents one or two or more metal elements selected from the group consisting of Mg, Zn, Cu, Fe, Cr, Mn, Ni, Al, B, Na, K, F, Cl, Br, I, Ca, Sr, Ba, Ti, Zr, Hf, Nb, Ta, Y, Yb, Si, S, Mo, W, V, Bi, Te, Pb, Ag, Cd, In, Sn, Sb, Ga, Ge, La, Ce, Nd, Sm, Eu, Tb, Dy, and Ho; the method comprising: a first step of adding an organic acid and cobalt hydroxide to a water solvent, and then adding phosphoric acid and lithium hydroxide thereto to prepare an aqueous raw material slurry (1); a second step of wet-pulverizing the aqueous raw material slurry (1) with a media mill to obtain a slurry (2) containing a pulverized product of raw materials; a third step of spray-drying the slurry (2) containing the pulverized product of raw materials to obtain a reaction precursor; and a fourth step of firing the reaction precursor.

Abstract: A negative thermal expansion material made of zirconium phosphate tungstate containing an Al atom, and having a thermal expansion coefficient of ?2.0×10?6 to ?3.3×10?6/K. According to the present invention, a negative thermal expansion material made of zirconium phosphate tungstate having various thermal expansion coefficients, and an industrially advantageous manufacturing method thereof can be provided.

Abstract: The present application provides a negative thermal expansion material having excellent dispersibility and packing properties in a positive thermal expansion material. The negative thermal expansion material of the present invention comprises spherical zirconium tungsten phosphate having a BET specific surface area, of 2 m2/g or smaller. The degree of sphericity is preferably 0.90 or more and 1 or less. Also preferably, the negative thermal expansion material further contains at least Mg and/or V as a subcomponent element. Also preferably, the content of the subcomponent element is 0.1% by mass or more and 3% by mass or less. Also preferably, the average particle size is 1 ?m or larger and 50 ?m smaller.

Abstract: It is intended to provide an industrially advantageous method for obtaining zirconium tungsten phosphate that is useful as a negative thermal expansion material and exhibits a single phase in X-ray diffraction. The method for producing zirconium tungsten phosphate according to the present invention comprises using a mixture of a tungsten compound and an amorphous compound containing phosphorus and zirconium as a reaction precursor and calcining the reaction precursor. Preferably, the reaction precursor has an infrared absorption peak at least at 950 to 1150 cm?1, and the maximum value of the infrared absorption peak in this range appears at 1030 (±20) cm?1.

Abstract: The objective of the present invention is to provide, in an industrially advantageous method, ?-lithium aluminate which has various favorable physical properties as a MCFC electrolyte holding plate with excellent heat stability and chemical stability, even when the ?-lithium aluminate is minute with the BET specific surface area being 10 m2/g or greater. A method for producing ?-lithium aluminate is characterized by mixing hydrated alumina and lithium carbonate in an Al/Li molar ratio of 0.95-1.01 and subjecting the obtained mixture (a) to a first firing reaction to obtain a fired product, and then subjecting a mixture (b) which is the obtained fired product to which an aluminum compound is added to a second firing reaction.

Abstract: It is intended to provide an industrially advantageous method for obtaining zirconium tungsten phosphate that is useful as a negative thermal expansion material and exhibits a single phase in X-ray diffraction. The method for producing zirconium tungsten phosphate according to the present invention comprises using a mixture of a tungsten compound and an amorphous compound containing phosphorus and zirconium as a reaction precursor and calcining the reaction precursor. Preferably, the reaction precursor has an infrared absorption peak at least at 950 to 1150 cm?1, and the maximum value of the infrared absorption peak in this range appears at 1030 (±20) cm?1.

Abstract: The present application provides a negative thermal expansion material having excellent dispersibility and packing properties in a positive thermal expansion material. The negative thermal expansion material of the present invention comprises spherical zirconium tungsten phosphate having a BET specific surface area of 2 m2/g or smaller. The degree of sphericity is preferably 0.90 or more and 1 or less. Also preferably, the negative thermal expansion material further contains at least Mg and/or V as a subcomponent element. Also preferably, the content of the subcomponent element is 0.1% by mass or more and 3% by mass or less. Also preferably, the average particle size is 1 ?m or larger and 50 ?m smaller.

Abstract: The purpose of the present invention is to provide an industrially advantageous method for producing ?-lithium aluminate which has physical properties that are suitable for use as an electrolyte holding plate of a MCFC having excellent thermal stability, even if the ?-lithium aluminate is a fine material having a BET specific surface area of 10 m2/g or higher in particular. Provided is a method for producing ?-lithium aluminate characterized by subjecting a mixture (a), which is obtained by mixing transitional alumina and lithium carbonate at an Al/Li molar ratio of 0.95-1.01, to a first firing reaction so as to obtain a fired product, and subjecting a mixture (b), which is obtained by adding an aluminum compound to the obtained fired product at quantities whereby the molar ratio of aluminum atoms in the aluminum compound relative to lithium atoms in the fired product (Al/Li) is 0.001-0.05, to a second firing reaction.

Abstract: The objective of the present invention is to provide, in an industrially advantageous method, ?-lithium aluminate which has various favorable physical properties as a MCFC electrolyte holding plate with excellent heat stability and chemical stability, even when the ?-lithium aluminate is minute with the BET specific surface area being 10 m2/g or greater. A method for producing ?-lithium aluminate is characterized by mixing hydrated alumina and lithium carbonate in an Al/Li molar ratio of 0.95-1.01 and subjecting the obtained mixture (a) to a first firing reaction to obtain a fired product, and then subjecting a mixture (b) which is the obtained fired product to which an aluminum compound is added to a second firing reaction.

Abstract: The purpose of the present invention is to provide an industrially advantageous method for producing ?-lithium aluminate which has physical properties that are suitable for use as an electrolyte holding plate of a MCFC having excellent thermal stability, even if the ?-lithium aluminate is a fine material having a BET specific surface area of 10 m2/g or higher in particular. Provided is a method for producing ?-lithium aluminate characterized by subjecting a mixture (a), which is obtained by mixing transitional alumina and lithium carbonate at an Al/Li molar ratio of 0.95-1.01, to a first firing reaction so as to obtain a fired product, and subjecting a mixture (b), which is obtained by adding an aluminum compound to the obtained fired product at quantities whereby the molar ratio of aluminum atoms in the aluminum compound relative to lithium atoms in the fired product (Al/Li) is 0.001-0.05, to a second firing reaction.

Abstract: The present invention provides an amorphous fine-particle powder which enables to obtain a fine perovskite-type barium titanate powder free from residual by-products such as barium carbonate and stable in quality, and a method for producing the amorphous fine-particle powder. The amorphous fine-particle powder is a fine-particle powder including titanium, barium, lactic acid and oxalic acid, wherein: the average particle size thereof is 3 ?m or less; the BET specific surface area thereof is 6 m2/g or more; the molar ratio (Ba/Ti) of Ba atoms to Ti atoms is 0.98 to 1.02; and the amorphous fine-particle powder is noncrystalline in X-ray diffraction and has a peak of an infrared absorption spectrum in each of a region from 1120 to 1140 cm?1 and a region from 1040 to 1060 cm?1.