The effective interaction within the transition metals is split into the central interaction between the ions and the ion-electron interaction. The former contribution is accounted for by taking central forces up to fourth neighbours in Ti and Hf and up to the fifth neighbour in Y. The latter contribution is, however, obtained following Bhatia's method on cubic metals. Phonon dispersion relations along symmetry directions and theta -T curve have been plotted and compared with the available experimental results.
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S. S. Kushwaha (1974) studied this question.
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