Many high-pressure phases of the III-V and II-VI semiconductors have been believed to have the diatomic equivalent of the (tetragonal) β-tin structure. Recent work has shown this to be incorrect in several cases. It is now shown that the same is true of all the remaining possibilities---AlSb, HgSe, InP, and GaP. The phases concerned all have orthorhombic structures of the Cmcm type. The apparent nonexistence of the β-tin structure has important implications for the structural systematics.
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Nelmes et al. (1997) studied this question.
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