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Phase transitions and metastable states in TlGaSe2 |
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| Authors: | FA Mikailov E Başaran E Şentürk L Tümbek TG Mammadov VP Aliev |
| Institution: | 1. Department of Physics , Gebze Institute of Technology , Gebze, 41400, Kocaeli, Turkey;2. Institute of Physics, Azerbaijan Academy of Sciences , 370143, Baku, Azerbaijan;3. Department of Physics , Gebze Institute of Technology , Gebze, 41400, Kocaeli, Turkey;4. Department of Physics , Sakarya University , 54100, Sakarya, Turkey;5. Institute of Physics, Azerbaijan Academy of Sciences , 370143, Baku, Azerbaijan |
| Abstract: | The results of measurements of the dielectric constant of TlGaSe2 in temperature range of successive phase transitions are presented. An anomaly in the temperature dependence of the real part of dielectric constant in TlGaSe2 has been observed at about 242?K in addition to anomalies at 115, 108, and also near 65?K as reported in previous publications. The presence of temperature hysteresis effects in temperature interval between 115 and 242?K allowed making a conclusion about possible existence of an incommensurate phase in the mentioned temperature range. A model of succession of the structural phase transitions in TlGaSe2 has been suggested. |
| Keywords: | Ferroelectrics Dielectric constant Phase transitions |