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The present invention provides a production method that can produce a garnet-type compound containing zirconium and lithium, the compound being in the form of fine particles, with high productivity. The method produces a garnet-type compound containing Zr, Li, and element M^(1 )(wherein M^(1 )is at least one element selected from the group consisting of La, Sc, Y, and Ce) as constituent elements. The method includes a first step of (1) mixing a first raw material and a second raw material to obtain a precipitate, the first raw material being a solution containing a zirconium carbonate complex and having a pH of at least 7.0 and not more than 9.5, and the second raw material containing a compound containing the above element M^(1 )as a constituent element; and (2) a second step of mixing the precipitate and a third raw material containing Li as a constituent element to obtain a mixture, and then firing the mixture at a temperature of less than 1,000 C. to obtain a fired product. The first raw material is prepared by mixing, at a prescribed molar ratio, at least a compound that contains a carbonate species and a compound that contains a zirconium species.


The present invention provides a production method that can produce a garnet-type compound containing zirconium and lithium, the compound being in the form of fine particles, with high productivity. The method produces a garnet-type compound containing Zr, Li, and element M^(1) (wherein M^(1) is at least one element selected from the group consisting of La, Sc, Y, and Ce) as constituent elements. The method includes a first step of (1) mixing a first raw material and a second raw material to obtain a precipitate, the first raw material being a solution containing a zirconium carbonate complex and having a pH of at least 7.0 and not more than 9.5, and the second raw material containing a compound containing the above element M^(1) as a constituent element; and (2) a second step of mixing the precipitate and a third raw material containing Li as a constituent element to obtain a mixture, and then firing the mixture at a temperature of less than 1,000C to obtain a fired product. The first raw material is prepared by mixing, at a prescribed molar ratio, at least a compound that contains a carbonate species and a compound that contains a zirconium species.


Patent
Daiichi Kigenso Kagaku Kogyo Co. | Date: 2016-09-14

Provided is a cerium-zirconium-based composite oxide having an excellent OSC, high catalytic activity, and excellent heat resistance, and also provided is a method for producing the same. The cerium-zirconium-based composite oxide comprises cerium, zirconium, and a third element other than these elements. The third element is (a) a transition metal element or (b) at least one or more elements selected from the group consisting of rare earth elements and alkaline earth metal elements. After a heat treatment at 1,000C to 1,100C for 3 hours, (1) the composite oxide has a crystal structure containing a pyrochlore phase, (2) a value of {I111/(I111+I222)} x 100 is 1 or more, and (3) the composite oxide has an oxygen storage capacity at 600C of 0.05 mmol/g or more, and an oxygen storage capacity at 750C of 0.3 mmol/g or more.


Patent
Daiichi Kigenso Kagaku Kogyo Co. | Date: 2016-04-13

The object of the present invention is to provide an oxide-based phosphor comprising elements other than rare earth elements as light-emitting elements, with low material costs, while achieving high luminous efficacy. The means for achieving the object is a phosphor comprising the following (1) to (3): (1) zirconium oxide, (2) titanium , and (3) at least one element selected from the group consisting of phosphorus, selenium, boron, and silicon.


Patent
Daiichi Kigenso Kagaku Kogyo Co. | Date: 2016-06-08

The present invention provides a method for producing an ingot of zirconium carbide at a low cost in an efficient manner. The present invention, specifically, provides a method for producing an ingot of zirconium carbide, characterized in that the ingot produced has a size of 50 mm or more, a density of 5.7 g/cm^(3) or more, and a Vickers hardness of 1,500 or more, and that the method includes the steps of:(1) Step 1 of mixing zirconium oxide with carbon to obtain a mixture thereof, wherein the carbon is present in an amount of 15 to 20% by mass based on the zirconium oxide in the mixture;(2) Step 2 of forming the mixture into granules;(3) Step 3 of melting the granules using argon plasma; and(4) Step 4 of slowly cooling the melt to obtain the ingot of zirconium carbide.


Patent
Daiichi Kigenso Kagaku Kogyo Co. | Date: 2016-07-06

The present invention provides a zirconium oxide-titanium oxide composite sol comprising single nano-level, monodisperse, and amorphous zirconium oxide-titanium oxide composite nanoparticles. Specifically, the present invention provides a zirconium oxide-titanium oxide composite sol comprising zirconium oxide-titanium oxide composite nanoparticles dispersed in a dispersion medium;wherein the zirconium oxide-titanium oxide composite nanoparticles have a ZrO_(2)/TiO_(2) composition ratio of 95/5 to 50/50, and a primary particle diameter of 10 nm or less, andthe dispersion medium is a polar dispersion medium.


Patent
Daiichi Kigenso Kagaku Kogyo Co. | Date: 2016-09-14

Provided is a method for producing an aqueous zirconium chloride solution having a higher decomposition rate of zircon sand and a lower impurity content, as compared with conventional methods. The method for producing an aqueous zirconium chloride solution according to the present invention comprises:step 1 of grinding zircon sand to an average particle diameter of 10 m or less;step 2 of adding a sodium compound to the ground zircon sand to thereby obtain a mixture;step 3 of firing the mixture in an iron container at 400C or less to thereby obtain a decomposed product;step 4 of firing the decomposed product in a stainless-steel container at 400 to 1,100C to thereby obtain a fired product;step 5 of dispersing the fired product in water to prepare a dispersion, and washing the fired product with water while adjusting the temperature of the dispersion to 70C or less, thereby obtaining a water-washed cake;step 6 of washing the water-washed cake with hydrochloric acid with a pH of 1 to 6 to thereby obtain zirconium hydrate; andstep 7 of dissolving the zirconium hydrate in hydrochloric acid, and then removing insoluble components to thereby obtain a salt solution.


Patent
Daiichi Kigenso Kagaku Kogyo Co. | Date: 2016-06-01

The present invention provides a sol comprising, as a dispersoid, amorphous Zr-O-based particles having a median particle diameter D_(50) of 50 to 200 nm, so as to enable control of the optimal rheology and the application characteristics of a mixture system incorporating the sol. More specifically, the present invention provides a sol comprising, as a dispersoid, amorphous compound particles containing zirconium and oxygen, the amorphous compound particles having a median diameter in a range of 50 to 200 nm.


Patent
Daiichi Kigenso Kagaku Kogyo Co. | Date: 2016-10-26

This invention provides a zirconia-based porous body having a pore diameter suitable for supporting catalytic active species, such as precious metals, small variability in pore diameter, and a sufficient specific surface area even after 12-hour heating at 1000C. Specifically, the invention provides a zirconia-based porous body in particle form having (1) a pore diameter peak at 20 to 100 nm in the pore distribution by BJH method, a P/W ratio of 0.05 or more wherein W represents half width of the peak and P represents height of the peak in the measured pore distribution curve, and a total pore volume of 0.5 cm^(3)/g or more; and (2) a pore diameter peak at 20 to 100 nm, the P/W ratio of 0.03 or more, a specific surface area of at least 40 m^(2)/g, and a total pore volume of 0.3 cm^(3)/g or more, after heat treatment at 1000C for 12 hours.


The present invention provides a sol comprising, as a dispersoid, amorphous ZrO--based particles having a median particle diameter D_(50 )of 50 to 200 nm, so as to enable control of the optimal rheology and the application characteristics of a mixture system incorporating the sol. More specifically, the present invention provides a sol comprising, as a dispersoid, amorphous compound particles containing zirconium and oxygen, the amorphous compound particles having a median diameter in a range of 50 to 200 nm.

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