Structure and Phase Transformation of Rhombohedral Selenium Composed of Se_6 Molecules
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A new allotrope of selenium has been found. X-ray analysis has revealed that the new form consists of hexameric molecules, Se_6, with synmtetry D_<3d>. It has been ascertained by rotational and Weissenberg methods that the crystal has a rhombohedral unit cell with lattice parameters in hexagonal axes, a=11.362±0.001 A, c=4.429±0.008 A, and belongs to space group R3^^-. Refinement of atomic parameters using the full matrix least squares method gives the following structural quantities: x=0.16021±0.00048, y=0.20227±0.00047, z=0.12045±0.00120, bond length 2.356±0.009 A, bond angle 101.1±0.3゜, and dihedral angle 76.2±40.4゜. Studies on the transformation by DSC and X-ray measurements revealed that the rhombohedral phase is irreversibly converted to the polycrystalline trigonal phase at temperatures above 105℃.
- 社団法人応用物理学会の論文
- 1980-10-05
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- Structure and Phase Transformation of Rhombohedral Selenium Composed of Se_6 Molecules