ホウ酸メラミンの結晶構造
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概要
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The crystal structure of melamine diborate(C_3N_6H_6・2H_3BO_3), well known as raw material of boron nitride, was determined by single crystal X-ray analysis. Molecules are packed in a monoclinic crystal system, space group P2_1/c, with a=0.3596(1)nm, b=2.0111(2)nm, c=1.41092(9)nm, β=92.12(2)°, Z=4 and crystal density is 1.627 g/cm^3. Molecules in the crystal are linked together by hydrogen-bonds, and form spirally stacked quasi-sheets parallel to a-xis. Bond lengths of hydrogen-bonds range from 0.181(2)nm to 0.209(2)nm. The crystal shows needlelike habit and its longitudinal direction is also parallel to a-axis. The preferred orientation, which was elucidated from powder X-ray diffraction pattern, is presumably due to the needlelike habit and is attenuated by grinding.
- 社団法人日本セラミックス協会の論文
- 1996-10-01