Abstract

ABSTRACTThe concept of diamond polytypism was examined and extended beyond the previous work to gain more analytical tools with which to understand and characterize these materials. This paper reports the band positions predicted for the expected infrared active modes of several diamond polytypes and the calculated diffraction patterns for the 21R and 15R polytypes. The infrared active modes were predicted on the basis of a generalized Brlllouin zone similar to that developed for silicon carbide polytypes. The diffraction patterns for the 21R and 15R polytypes were calculated in a manner similar to that used previously for the hexagonal polytypes. These results complete the suite of basic diffraction patterns for diamond polytypes.

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