| abstract |
It has an octahedral shape that is flat in the opposite direction of the hexagonal surface, which is composed of two opposite hexagonal surfaces and six rectangular surfaces, The average distance D between the two opposite angles in the hexagonal surface is in the range of 3 to 110 μm, the length L of the short side of the rectangular surface is in the range of 2 to 45 μm, and the L/D is in the range of 0.05 to 0.8. In between, The hexagonal shape and the rectangular shape intersect by forming a curved surface without forming one corner, and Aluminum nitride crystal particles having a true density in the range of 3.20 to 3.26 g/cm 3, aluminum nitride powder containing the same, their preparation method, organic polymer composition containing the aluminum nitride crystal particles, and a sintered body are provided. |