BLUE MATERIAL AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide a blue material and a method for manufacturing the same. SOLUTION: This blue material is expressed by general formula: LaTix(OyN1-y)z(wherein Ti/La>1; y≥0.99; and z≤2.6) and has, in a diffusion reflectance spectrum of a visible light region (380-750 nm), the highest diffusion reflectance in the region of a blue light with the wavelength of 430-480 nm, and has a diffusion reflectance of ≤2/3 of the highest diffusion reflectance at the longest wavelength 750 nm of a visible light. This blue material is obtained by nitriding and annealing a precursor powder 101 of a lanthanum and titanium oxide (La-Ti-O) with ammonia gas 105 and thereafter developing an oxygen loss with hydrogen gas 109. By adding strontium (Sr) for nitriding and annealing with ammonia gas in place of the development of the oxygen loss by hydrogen gas, the blue material becomes deeper in blue color than ever. This blue material provided is stable even at such a high temperature as 400°C and suitable for a pigment. COPYRIGHT: (C)2010,JPO&INPIT