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Site symmetry; internal strains; Lagrangian strains; inversion symmetry

The determination of the internal strains on the coupling parameter approach becomes very involved particularly when the number of atoms per unit cell is very large. It is shown in this paper that a knowledge of the site symmetry of the atoms helps one in determining the number of non-vanishing internal strain coefficients easily. The internal strain coefficients of two symmetry connected atoms can also be related. Examples are shown to illustrate these ideas.

R Srinivasan¹ G Lakshmi¹

1. Department of Physics, Indian Institute of Technology, Madras - 600036

Published

April 1976

Manuscript received

23 October 1975

Manuscript revised

7 January 1976