Acta Crystallographica Section B

Structural Science

Volume 55, Part 2 (April 1999)

short communications

Acta Cryst. (1999). B55, 255-257 [ doi:10.1107/S0108768198011987 ]

Identification of a new trace 114R SiC by HREM

X. Y. Yang, G. Y. Shi, X. M. Meng, H. L. Huang and Y. K. Wu

Abstract: Using electron diffraction patterns and high-resolution electron microscopy (HREM), a trace 114R SiC in commercial [alpha] -SiC powder (mainly 6H SiC according to X-ray diffraction) has been discovered. In a hexagonal unit cell its stacking sequence is [(33)₄(34)₂]₃, the periodicity along the c axis is 286.14 Å and a = b = 3.073 Å. 114R belongs to the structure series of (33)n34(33)m34 predicted theoretically by Pandey & Krishna [Mater. Sci. Eng. (1975), 20, 243-249] on the basis of the faulted matrix model.