Frequency distribution of phonons in the
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J.W. Leech; C.J. Peachey
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Article
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1968
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Elsevier Science
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English
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Lattice dynamical calculations are reported for two possible space groups (Pnma and Cmc21). The force constants were found by varying the paramete 1's in appropriate semi-empirical inter-atomic potentia1 functions to obtain agreement with observed infra-red absorption frequencies. A frequency distr