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首页> 外文期刊>Phase Transitions >Phase transitions in PbZr0.72Sn0.28O3 single crystals studied by Raman spectroscopy
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Phase transitions in PbZr0.72Sn0.28O3 single crystals studied by Raman spectroscopy

机译：拉曼光谱研究PbZr0.72Sn0.28O3单晶的相变

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摘要

Raman light scattering measurements in the temperature range from 80 to 830K were performed on a PbZr0.72Sn0.28O3 single crystal. The frequencies of the Raman lines were analyzed and discussed in terms of the sequence of structural phase transitions. It was found that Raman spectrum displays important changes near 440, 480 and 493K. The incorporation of more than 25 mol% of Sn4+ ions into the structure of PbZrO3 enhances polar fluctuations above T-C as compared to the less Sn-doped crystals. These fluctuations lead to appearance of a ferroelastic intermediate phase below T-C. It is demonstrated that the structural phase transformation in PbZr0.72Sn0.28O3 can be considered as the result of softening of a number of modes.
机译：在PbZr0.72Sn0.28O3单晶上进行了80至830K温度范围内的拉曼光散射测量。根据结构相变的顺序分析和讨论了拉曼谱线的频率。发现拉曼光谱在440、480和493K附近显示出重要的变化。与掺杂较少的Sn的晶体相比，在PbZrO3的结构中掺入超过25 mol％的Sn4 +离子会增加T-C上方的极性波动。这些波动导致在T-C以下出现铁弹性中间相。结果表明，PbZr0.72Sn0.28O3中的结构相变可以看作是多种模式软化的结果。

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