Tian Yongshang, Ma Mingyang, Li Shuiyun, Dong Junli, Ji Xiang, Wu Haitao, Wang Jinshuang, Jing Qiangshan
College of Chemistry and Chemical Engineering, Henan Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang 464000, China.
School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8552, Japan.
Materials (Basel). 2023 Mar 15;16(6):2369. doi: 10.3390/ma16062369.
Lead-free barium calcium titanate zirconate (BCTZ) ceramics doped with a single rare-earth element generally exhibit excellent piezoelectric properties. However, their electrical properties deteriorate at an excessive dopant content, limiting their application. In this study, amphoteric neodymium (Nd) and yttrium (Y)-codoped BCTZ-NY ceramics were synthesized via a solid-state reaction at 1240 °C. The influences of the Y content () on the structural features, electrical properties, mechanical properties, and thermophysical properties were investigated. At a small (<0.18 mol%), Y could enhance the fracture strength and electrical properties by eliminating oxygen vacancies, defect dipoles, and/or structural defects. However, the outstanding performance deteriorated with excessive . Additionally, the mechanism of the defect chemistry at different was deduced. At an yttrium content of 0.18 mol%, the ceramic exhibited high piezoelectricity and ferroelectricity with low domain-switching activation energy ( = 0.401 eV), indicating that it could replace commercial lead-based piezoelectric ceramics.
掺杂单一稀土元素的无铅钛酸钡锆钙（BCTZ）陶瓷通常表现出优异的压电性能。然而，当掺杂剂含量过高时，它们的电学性能会变差，从而限制了其应用。在本研究中，通过在1240℃下的固态反应合成了两性钕（Nd）和钇（Y）共掺杂的BCTZ-NY陶瓷。研究了Y含量（）对结构特征、电学性能、力学性能和热物理性能的影响。在Y含量较小（<0.18 mol%）时，Y可以通过消除氧空位、缺陷偶极子和/或结构缺陷来提高断裂强度和电学性能。然而，随着Y含量过高，优异的性能会变差。此外，还推导了不同Y含量下的缺陷化学机理。在钇含量为0.18 mol%时，该陶瓷表现出高压电性和铁电性，且具有低的畴翻转激活能（ = 0.401 eV），表明它可以替代商用铅基压电陶瓷。
