Effect of Temperature and Pressure on Low-Frequency Raman Scattering from Strontium Tantalate Ceramic Material

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Physics of the Solid State Pub Date : 2024-07-19 DOI:10.1134/S1063783424600559
Jizhen Hui, Anwar Hushur, Amat Hasan, Seiji Kojima, Abliz Mattursun
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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.

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温度和压力对钽酸锶陶瓷材料低频拉曼散射的影响
摘要 研究了 Sr2Ta2O7 陶瓷结构相变中低频拉曼散射的温度和压力相关性。拉曼光谱是在 0 至 -185°C 的温度范围内测量的。在 T = -110°C 时,B1g 对称的一个低洼模式的拉曼位移与温度有关。Sr2Ta2O7 的这种反常现象与铁电相变有关。在冷却过程中,B1g 模式的峰宽在 150°C 时发生变化,B3g 和 B1g 模式的拉曼位移随温度的变化也变得异常。在高压下,我们发现了 4 至 5.5 GPa 之间的相变。角度色散 X 射线衍射数据表明,相变是从不相称到相称态。
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来源期刊
Physics of the Solid State
Physics of the Solid State 物理-物理:凝聚态物理
CiteScore
1.70
自引率
0.00%
发文量
60
审稿时长
2-4 weeks
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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