Catching the intermediate phase in PZT 99/1 single crystals

0439478 - FZÚ 2015 RIV GB eng J - Článek v odborném periodiku
Buixaderas, Elena - Ostapchuk, Tetyana - Kroupa, Jan - Savinov, Maxim - Gregora, Ivan - Hlinka, Jiří
Catching the intermediate phase in PZT 99/1 single crystals.
Phase Transitions. Roč. 87, 10-11 (2014), s. 1105-1113. ISSN 0141-1594. E-ISSN 1029-0338
Grant CEP: GA ČR GA13-15110S
Institucionální podpora: RVO:68378271
Klíčová slova: Raman spectroscopy * phonons * PZT * antiferroelectrics
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 0.954, rok: 2014

We have investigated single crystals of PbZrO3 substituted with 1% of Ti (PZT 99/1) by means of optical microscopy, micro-Raman scattering, second harmonic generation and dielectric spectroscopy, on heating to and cooling from its cubic phase. Our measurements confirm that these crystals undergo two phase transitions within the approximate temperature range 488–503 K, in agreement with previous findings. The lower temperature phase, TAFE, shows much stronger thermal hysteresis – about 10 K, which undoubtedly indicates its strong first-order character. Second harmonic generation showed a marked signal between the two anomalies, implying that the intermediate phase is non-centrosymmetric. In situ Raman spectroscopy and the presence of second harmonic signal, excluded the antiferroelectric state of this phase. The intermediate phase of PZT 99/1 crystal is similar to the rhombohedral ferroelectric with the R3m (Z = 1) space group.
Trvalý link: http://hdl.handle.net/11104/0242767