To meet the increasing demand for high temperature piezoelectric actuator and transducer applications, much attention has been paid on exploring piezoelectric materials which can work efficiently under high temperature conditions. In the present study, a new Bi-based perovskite (ABO₃) of (1 − x)PbTiO₃-xBi(Zn_1/2Hf_1/2)O₃ has been investigated. For the compositions of x < 0.20, it is interesting to observe that the tetragonality (c/a) remains relatively constant over the entire tetragonal phase. This unusual phenomenon is in contrast to the behavior of most PbTiO₃-based solid solutions, wherein the c/a is usually reduced. As a result, the Curie temperature (T_C) increases from 490 °C for pure PbTiO₃, to as high as 528 °C for x = 0.10, indicating the present PbTiO₃-Bi(Zn_1/2Hf_1/2)O₃ to be a high-T_C piezoelectric material. It is proposed that the maintained large tetragonality and high T_C could be attributed to the large spontaneous polarization (P_S) displacements induced by the strong Pb/Bi-O hybridization and coupling interactions between Pb/Bi and B-site ferroelectric-active cations.

中文翻译：

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（1- x）PbTiO ₃ - x Bi（Zn _1/2 Hf _1/2）O ₃的新型Bi基钙钛矿中高居里温度压电陶瓷的制备与表征

为了满足对高温压电致动器和换能器应用不断增长的需求，人们对开发可在高温条件下有效工作的压电材料给予了极大的关注。在本研究中，已经研究了一种新型的（1- x）PbTiO ₃ - x Bi（Zn _1/2 Hf _1/2）O _3的Bi基钙钛矿（ABO ₃）。对于x <0.20的成分，有趣的是，在整个四方相中四方性（c / a）保持相对恒定。这种不寻常的现象与大多数PbTiO ₃的行为相反基固溶体，其中c / a通常降低。结果，居里温度（T _C）从纯PbTiO _3的490°C升高到x = 0.10时高达528°C ，表明存在的PbTiO ₃ -Bi（Zn _1/2 Hf _1/2） O ₃是高T _C压电材料。建议保持大四方性和高T _C可以归因于大自发极化（P _S）由强Pb / Bi-O杂化以及Pb / Bi与B位铁电活性阳离子之间的偶联相互作用引起的位移。