MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
First Principles Lattice Dynamics Calculations of Ag+ Doped KX (X=Cl, Br and I)
Hidenobu MurataTomoyuki YamamotoIsao Tanaka
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2009 Volume 50 Issue 5 Pages 999-1003

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Abstract

Phonon states of Ag doped potassium halides, KX:Ag+ (X=Cl, Br and I), are computed by a first principles lattice dynamic method using 64-atoms supercells. Results are compared to experimental data in literature. Phonon density of states of host KCl and KI crystals satisfactorily agree to the experimental inelastic neutron scattering data. Experimental frequencies of the impurity-induced infra-red (IR) and Raman active modes in the low frequency region are reasonably well reproduced because the vibrations are localized within the first nearest neighbour anions of the Ag+-ion. On the other hand, limitations of present calculations to reproduce the high frequency impurity-induced modes are pointed out. They are less localized to the Ag+-ion.

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© 2009 The Japan Institute of Metals and Materials
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