Ferrielectricity in the Archetypal Antiferroelectric, PbZrO 3
Ferrielectricity in the Archetypal Antiferroelectric, PbZrO 3
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原型反铁电体 PbZrO 3 中的亚铁电性
DOI：
10.1002/adma.202206541
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发表时间：
2022
影响因子：
29.4
通讯作者：
Bassiri‐Gharb, Nazanin
中科院分区：
文献类型：
--
作者：
Yao, Yulian;Naden, Aaron;Tian, Mengkun;Lisenkov, Sergey;Beller, Zachary;Kumar, Amit;Kacher, Josh;Ponomareva, Inna;Bassiri‐Gharb, Nazanin
反铁电材料的反极性和极性相变由外加电场控制，具有高效率、巨大的电热效应和卓越的机电响应等特点。pbzro3是第一个发现的反铁电材料，也是典型的反铁电材料。然而，处理相纯pbzro3的实质性挑战限制了对未掺杂成分的研究，阻碍了对该材料中相变的理解，或者揭开了在锆酸铅薄膜中观察到的低场铁电相的有争议的起源。利用高取向pbzro3薄膜，在没有外加电场的情况下观察到室温铁电相，具有自发极化的振幅和方向调制以及相变所需的临界电场的大各向异性。铁电态观测结果与理论预测在质量上是一致的，并且与非常高的介电可调性和超高应变（高达1.1%）相关。这项工作表明需要重新评估这种原型材料中的反铁电性的基础科学。
Antiferroelectric materials, where the transition between antipolar and polar phase is controlled by external electric fields, offer exceptional energy storage capacity with high efficiencies, giant electrocaloric effect, and superb electromechanical response. PbZrO3is the first discovered and the archetypal antiferroelectric material. Nonetheless, substantial challenges in processing phase pure PbZrO3have limited studies of the undoped composition, hindering understanding of the phase transitions in this material or unraveling the controversial origins of a low‐field ferroelectric phase observed in lead zirconate thin films. Leveraging highly oriented PbZrO3thin films, a room‐temperature ferrielectric phase is observed in the absence of external electric fields, with modulations of amplitude and direction of the spontaneous polarization and large anisotropy for critical electric fields required for phase transition. The ferrielectric state observations are qualitatively consistent with theoretical predictions, and correlate with very high dielectric tunability, and ultrahigh strains (up to 1.1%). This work suggests a need for re‐evaluation of the fundamental science of antiferroelectricity in this archetypal material.