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Impurity clusters; impurity modes; lattice dynamics

The modes of vibration of a three impurity cluster in a diatomic linear chain is studied. The configuration of the three impurity atoms is such that two of these go into next nearest neighbour sites in one of the sub-lattices whereas the third occupies the central in between site in the other sub-lattice. New local, gap and inband modes are seen to exist, besides the ones corresponding to the impurity pairs. A new feature which appears is that the frequencies of some of the pair modes remain totally unaffected in the presence of the third impurity atom.

P Nayak¹ S N Behera¹

1. Institute of Physics, A/105 Saheed Nagar, Bhubaneswar - 751 007

Published

June 1978

Manuscript received

24 November 1977

Manuscript revised

3 April 1978