Plate-like alumina particle and a manufacturing method for the same

A plate-like alumina particle, in which the [001] plane is developed, that includes molybdenum in the particle and having:

• an aspect ratio obtained by dividing an average particle size by a thickness of 2 or more,
• and a thickness of 0.01-5 μm.

A polygonal plate-like alumina particle that includes molybdenum in the particle and having an aspect ratio obtained by dividing an average particle size by a thickness of 2 to 500, a thickness of 0.01-5 μm, and an average particle size of 0.1 to 500 μm;

• wherein the particle is obtained by firing an aluminum compound in the presence of a fluxing agent and in the presence of a shape-controlling agent,
• wherein the shape-controlling agent is a compound including silicon, a silicon atom, a compound including sodium or a sodium atom;
• and wherein the fluxing agent is a molybdenum compound.