With an aim to provide a method for producing an oxide particle with controlled color characteristics and also provide an oxide particle with controlled color characteristics, the present invention provides a method for producing an oxide particle, wherein the color characteristics of the oxide particle are controlled by controlling a ratio of an M-OH bond between an element (M) and a hydroxide group (OH) or an M-OH bond/M-O bond ratio, where the element (M) is one element or plural different elements other than oxygen or hydrogen included in the oxide particle selected from metal oxide particles and semi-metal oxide particles. According to the present invention, by controlling the M-OH bond or the M-OH bond/M-O bond ratio of the metal oxide particle or the semi-metal oxide particle, the oxide particle with controlled color characteristics of any of reflectance, transmittance, molar absorption coefficient, hue, and saturation can be provided.

According to an embodiment of the present invention, a method for preparing a graphite-titanium oxide composite comprises (S1) a surface-modifying graphite with benzyl alcohol or a cellulose-based material using a sol-gel method, (S2) distributing the surface-modified graphite in a solvent, adding a titanium precursor to the solvent, and mixing the titanium precursor with the surface-modified graphite to obtain a graphite-titanium mixture, and (S3) thermally treating the graphite-titanium mixture to grow a titanium oxide on a surface of the graphite.

The present invention relates to a method of producing carbon-coated lithium metal phosphate from a raw material containing lithium, comprising providing a solution containing lithium bicarbonate from an industrial process stream; reacting the lithium bicarbonate in the solution with metal ions, phosphate ions and a carbon source; separating the solids from the solution containing lithium bicarbonate by solid-liquid separation; and heat treating the solids to provide a carbon covered lithium metal phosphate. The method can be carried out continuously to produce lithium ion cathode chemicals in particular for the electrochemical industry, e.g. for ion cathode chemicals.

It is an object of the present disclosure to provide a method for inexpensively producing a high-performance barium sulfate powder which is obtained by using inexpensive barium sulfide as a raw material, has a high whiteness degree, and can suppress the generation of volatile components.

A method for producing a barium sulfate powder comprising a step of heat treating a raw barium sulfate powders obtained by using barium sulfide as a raw material at 600 to 1300° C., wherein a retention time X (minutes) at a heat treatment temperature of t ° C. is more than time expressed by the following general formula:

X (minutes)=A×10.sup.6×e.sup.(−0.015×t)

A is 8 or more, and an upper limit of X is 3000 minutes in the formula.

Molybdenum-silicon carbide composite powder and a fabrication method thereof are provided. The molybdenum-silicon carbide composite powder includes a micro-scale silicon carbide powder and a plurality of submicron-scale molybdenum particles bonding on the surface of the silicon carbide powder.

An abrasive particle having an irregular surface, wherein the surface roughness of the particle is less than about 0.95. A method for producing modified abrasive particles, including providing a plurality of abrasive particles, providing a reactive coating on said particles, heating said coated particles; and recovering modified abrasive particles.

The present invention relates to iron oxide red pigments having improved color values, a process for producing these improved iron oxide red pigments by the Penniman red process using nitrate (also referred to as nitrate process or direct red process) and an apparatus for the production thereof.

A production process for carbon-coated silicon material includes the step of: heating CaSi2 and a halogen-containing polymer at a temperature being a carbonization temperature or more of the halogen-containing polymer in a state where the CaSi2 and the halogen-containing polymer coexist.

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 m.sup.2/g to 50 m.sup.2/g.

Provided is a semiconductor nanoparticle complex in which a ligand is coordinated to a surface of a semiconductor nanoparticle. The semiconductor nanoparticle includes In and P, the ligand includes a mercapto fatty acid ester represented by the following general formula, and the mercapto fatty acid ester has an SP value of 9.30 or less.

General formula: HS—R.sub.1—COOR.sub.2 (where R.sub.1 is a C.sub.1-11 hydrocarbon group and R.sub.2 is a C.sub.1-30 hydrocarbon group). The present invention can provide a semiconductor nanoparticle complex that keeps high fluorescence quantum yield before and after purification.