Aluminum-oxide-based-composition-containing zirconium nitride powder and method for producing same

An aluminum-oxide-based-composition-containing zirconium nitride powder comprising:

• particles each of which is mainly composed of zirconium nitride and has a surface to which an aluminum oxide-based composition partially adheres,
• wherein the aluminum-oxide-based-composition-containing zirconium nitride powder contains aluminum in a proportion of greater than 1% by mass and 15% by mass or less in terms of a total content of 100% by mass, and has a specific surface area of 30 m2/g to 90 m2/g measured by a BET method, and
• wherein in a case where a dispersion is prepared so that a concentration of the aluminum-oxide-based-composition-containing zirconium nitride powder is 50 ppm, and a transmission spectrum of the dispersion is measured, a light transmittance X at 370 nm is 20% or greater, a light transmittance Y at 1,000 nm is 35% or less, and a ratio (X/Y) of the light transmittance X at 370 nm to the light transmittance Y at 1,000 nm is 1.2 or greater.