Phonon spectra of hexagonal potassium tungsten bronze (K0,33WO3)
- 1 January 1977
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 16 (1) , 115-118
- https://doi.org/10.1080/00150197708237133
Abstract
The phonon dispersion curves of hexagonal potassium tungsten bronze have been investigated through inelastic scattering of thermal neutrons. The low frequency modes along the [ξ; 0,0|, [ξ ξ, 0] and [0,0, ξ] symmetry directions have been determined at room temperature. Of particular interest is the occurrence of relatively flat transverse acoustic modes near 1.3 Thz. These modes would seem to be responsible for the dramatic departure from Debye-like behavior exhibited in a crude evaluation of the phonon density of states. The resulting maximum in g(v)/v 2 agrees well with the frequency of an Einstein mode postulated by Bevolo et al. 1 as a possible explanation for anomalies in the heat capacity.Keywords
This publication has 7 references indexed in Scilit:
- Effect of lattice instability on superconductivity in sodium tungsten bronzePhysical Review B, 1976
- Heat capacity of hexagonal tungsten bronzesPhysical Review B, 1974
- Growth of tungsten bronze crystals by fused salt electrolysisJournal of Crystal Growth, 1972
- The tungsten bronzes and related compoundsQuarterly Reviews, Chemical Society, 1968
- Lattice Dynamics, Heat Capacities, and Debye-Waller Factors for Be and Zn Using a Modified Axially Symmetric ModelPhysical Review B, 1965
- Thermal study of the tungsten bronzes—I heat capacity of Na0.679WO3 in the range 15–300°KJournal of Physics and Chemistry of Solids, 1964
- Studies on the Hexagonal Tungsten Bronzes of Potassium, Rubidium, and Cesium.Acta Chemica Scandinavica, 1953