发表机构
FZU - Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过X射线衍射发现PbTiO3薄膜在铁电-顺电转变中存在异常相共存区，并揭示垂直应变梯度促成该共存态。
AI 中文摘要
对生长在DyScO3衬底上的PbTiO3外延薄膜，在20-500摄氏度温度范围内进行了X射线衍射研究。研究发现，铁电到顺电的相变过程经历了一个特殊的过渡共存态，该状态延伸于402摄氏度至414摄氏度之间。在此温度区间内，于405摄氏度时发生畴结构转变，三畴c/a1/a2多孪晶相转变为普通的c/a2孪晶相。研究提出，两种独立孪晶相与顺电相的共存是由薄膜中的垂直应变梯度所促成的。
英文摘要
A PbTiO3 epitaxial thin film grown on a DyScO3 substrate was studied by x-ray diffraction in the temperature range of 20-500 degrees Celsius. It is found that the ferroelectric to paraelectric phase transition proceeds through a peculiar transitional coexistence state extending between 402 degrees Celsius and 414 degrees Celsius. Within this temperature interval, at a temperature of 405 degrees Celsius, a domain structure transition occurs, at which the three-domain c/a1/a2 polytwin phase transforms into an ordinary c/a2 twinned phase. It is proposed that the coexistence of two independent twinned phases with the paraelectric phase is enabled by vertical strain gradients in the film.
Comments6 pages, 4 figures
