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n5:cgwangularforces n5:latticespecificheat n5:phonondispersioncurves n5:translationalsymmetry n5:elasticconsistency n5:bodycentredtetragonalindium n5:latticedynamics
dcterms:title
Lattice dynamical study of body-centred tetragonal indium
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n2:ramamurthyv n2:rajendraprasadsb
dcterms:abstract
Abstract. The phonon dispersion curves, phonon frequency distribution function as well as the lattice specific heat of body-centred tetragonal indium have been deduced using a lattice dynamical model which includes central, angular and volume forces. Six elastic constants, four zone boundary frequencies and an equilibrium condition were used in the evaluation of the force constants. It is shown that this model is elastically consistent and satisfies the symmetry requirements of the lattice, the phonon frequencies of indium deduced from it are in very good agreement with the experimental values of Reichardt and Smith and the theoretical values of Garrett and Swihart, and theθD values compare well with the experimental values over a wide temperature range. The apparent discrepancies in the phonon dispersion curves and theθD-T curves obtained from deficient models, importance of umklapp processes and the significance of angular forces in the lattice dynamical models are discussed.
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BF02847377
dcterms:dateCopyrighted
1982
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