Jizhen Hui, Anwar Hushur, Amat Hasan, Seiji Kojima, Abliz Mattursun
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Effect of Temperature and Pressure on Low-Frequency Raman Scattering from Strontium Tantalate Ceramic Material
Abstract
The temperature and pressure dependences of low-frequency Raman scattering were studied on structural phase transformations of Sr2Ta2O7 ceramics. The Raman spectrum was measured over a temperature range from 0 to –185°C. The temperature dependence of the Raman shift of a low-lying mode of the B1g symmetry shows at T = –110°C. This anomaly of Sr2Ta2O7 is related to a ferroelectric phase transition. During cooling, the peak width of the B1g mode shows a change at 150°C, and the temperature dependence of Raman shifts of B3g, and B1g modes becomes abnormal. Under high pressure, we discovered a phase transition between 4 and 5.5 GPa. Angle-dispersive X-ray diffraction data suggest the phase transition from incommensurate to commensurate states.
期刊介绍：
Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.
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