Raman study of temperature‐induced phase transitions in lead hafnate (PbHfO3)
Raman study of temperature‐induced phase transitions in lead hafnate (PbHfO3)
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DOI：
10.1002/jrs.1250250508
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发表时间：
1994-05
影响因子：
2.5
通讯作者：
Shiv k. Sharma;A. Jayaraman;C. P. Chowdhury;S. Y. Wang
中科院分区：
文献类型：
--
作者：
Shiv k. Sharma;A. Jayaraman;C. P. Chowdhury;S. Y. Wang
报道了常压下对PbHfO3多畴反铁电单晶的高温拉曼光谱研究结果。拉曼光谱特征的变化表明，在435 ± 1 K和484 ± 1 K处发生了温度诱导相变。第一个转变可能是向四方晶系结构转变，第二个转变是向立方钙钛矿相转变。该行为与PbHfO 3的早期X射线研究一致。在PbHfO3的拉曼光谱中没有检测到与跃迁相关的软模行为。在高温拉曼光谱中观察到的PbHfO3的变化是类似的同质结构的PbZrO3的光谱中发现的。
Results of a high-temperature Raman spectroscopic investigation up to 522 K carried out at ambient pressure on an antiferroelectric PbHfO 3 multi-domain single crystal are reported. The changes in the Raman spectral features show that temperature-induced phase transitions occur at 435 ± 1 and at 484 ± 1 K. The first transition is possibly to a tetragonal structure and the second is to the cubic perovskite phase. The behavior is consistent with the earlier x-ray study of PbHfO 3 . No soft mode behavior associated with the transitions was detected in the Raman spectra of PbHfO 3 . The changes observed in the high-temperature Raman spectra of PbHfO 3 are similar to those found in the spectra of isostructural PbZrO 3 .