On Debye temperature anomaly observed in Ge-Se-Ag glasses

Anomalous values of Debye temperature have been obtained from recoil free factor measurements Ge-Se-Ag glasses recently B. Arcondo, M.A. Urena, A. Piarristeguy, A. Pradel, M. Fontana, Physica B 389 (2007) 77]. In the present paper we show that this anomaly may arise due to the presence of anharmonic potential at the high spin ferrous site. We use q Lamb Mossbauer factor and anharmonic Lamb Mossbauer factor to study this anharmonicity.