Plate-like alumina particle and method for manufacturing plate-like alumina particle

A method for manufacturing a plate-like alumina particle, the method comprising:

• mixing an aluminum compound containing an aluminum element of 50% by mass or more in a form of Al2O3, a molybdenum compound containing a molybdenum element of 7% by mass or more and 40% by mass or less in a form of MoO3, and a raw material germanium compound of 0.4% by mass or more and less than 1.5% by mass in a form of GeO2 to produce a mixture;
• and
• firing the mixture,
• wherein each of the 50% by mass, the 7% by mass, the 40% by mass, the 0.4% by mass, and 1.5% by mass is a mass percentage with respect to a total amount of raw materials in forms of oxides which is assumed to be 100% by mass,
• for the plate-like alumina particle, a ratio I(006)/I(113) of a peak intensity I(006) to a peak intensity I(113) is 0.2 or more,
• the peak intensity I(006) is an intensity of a peak at 2θ=41.6±0.3 degrees which corresponds to a (006)-face diffraction peak obtained by X-ray diffraction measurement using a Cu-Kα ray, and
• the peak intensity I(113) is an intensity of a peak at 2θ=43.3±0.3 degrees which corresponds to a (113)-face diffraction peak obtained by X-ray diffraction measurement using a Cu-Kα ray.