Microwave study of the soft ferroelectric mode in TlGaSe2
- 1 July 1985
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 65 (1) , 201-209
- https://doi.org/10.1080/00150198508008898
Abstract
The paper presents the results of the microwave investigations of the dielectric dispersion in semiconducting ferroelectric TlGaSe2 crystals over the frequency region from 0.6 to 78 GHz. The dielectric dispersion is caused by the strongly overdamped soft resonant ferroelectric mode. In the paraelectric phase, its frequency varies according to vr2 = A (T - Tc) with A = (500 ± 50) GHz2 K-1. At the Curie point Tc the frequency vr = 60 GHz, and the damping constant γ = 250 GHz. The large anharmonicity of the soft ferroelectric mode causes the dispersion of the dielectric permittivity of TlGaSe2 crystals over the whole microwave frequency region.Keywords
This publication has 10 references indexed in Scilit:
- Soft microwave mode in SbSI—type crystalsFerroelectrics, 1984
- Displacive - order-disorder crossover IFI ferroelectricsFerroelectrics, 1984
- Microwave resonant dielectric dispersion in SbS0.7Se0.3I crystalsPhase Transitions, 1983
- High-pressure Raman study of the ternary chalcogenides TlGa, TlGa, TlIn, and TlInPhysical Review B, 1982
- Microwave dielectric spectroscopy of chain crystalsFerroelectrics, 1981
- Raman scattering and phase transformations of TlGaSe2 and TlGaS2 under pressurePhysica Status Solidi (b), 1979
- Raman and Infrared Spectra of TlGaSe2Physica Status Solidi (b), 1978
- Investigations of the central mode in SbSI at microwave frequenciesFerroelectrics, 1978
- Notizen: Zur Struktur ternärer Chalkogenide des Thalliums mit Aluminium, Gallium und Indium, XXII* / On the Structure of Ternary Thalliumchalkogenides with Aluminium, Gallium and Indium, XXII*Zeitschrift für Naturforschung B, 1974
- Dynamic Susceptibility of Classical Anharmonic OscillatorProgress of Theoretical Physics, 1970