Abstract
In the present communication a method based on the three body forces for the evaluation of second and third order elastic constants of mixed ammonium halides has been described. The Lundqvist three body potential is used along with long range Coulombian and short-range overlap repulsive potentials. The latter is taken of the Born-Mayer type and effective up to first neighbours only. It has been assumed that the charge transfer and short-range parameters depend linearly on the composition of solid solutions. Theoretical results obtained, for the entire range of compositions of mixed NH4Cl and NH4Br, have been compared with the recently measured experimental values and the theoretical results of other workers, whenever these are available.
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The authors are thankful to Dr. J. Shanker, Department of Physics, Agra University, Agra, for helpful discussions.
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Bedi, S.S., Singh, J. Elastic constants of mixed ammonium halides. Czech J Phys 40, 903–908 (1990). https://doi.org/10.1007/BF01597961
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DOI: https://doi.org/10.1007/BF01597961