Recent discovery of giant electrostriction in bulk polycrystalline ceramics and thin films of rare earth (RE (III)) substituted ceria (CeO) driven by electroactive defect complexes and their coordinated elastic response, expands the material spectrum for electrostrain applications beyond the conventional piezoelectric materials. Bulk ceramics provide an ideal platform to systematically study electrostriction as a function of parameters such as RE-defect () interaction and RE concentration. In this work, we perform structure-property correlation studies in bulk ceramics of RE substituted ceria (RECO) with RE=, La and Gd, all of them having weak dopant-defect interaction, with Y- being attractive, La- being repulsive, and Gd- being neutral. We employ large signal measurements to measure the electrostrictive coefficients of all the RECO ceramics, with varying concentration of RE, and show that an attractive defect-dopant interaction with atleast 20% of substituent ion concentration yields both giant M and Q electrostrictive response.

中文翻译：

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RE (III) 取代的 CeO2 中的巨电致伸缩：RE-[公式省略]相互作用和 RE 浓度的影响

最近在块状多晶陶瓷和稀土（RE（III））取代二氧化铈（CeO）薄膜中发现了由电活性缺陷复合物驱动的巨电致伸缩及其协调的弹性响应，将静电应变应用的材料范围扩展到传统压电材料之外。块体陶瓷提供了一个理想的平台，可以系统地研究电致伸缩与稀土缺陷 () 相互作用和稀土浓度等参数的函数关系。在这项工作中，我们对 RE 取代二氧化铈 (RECO) 的块状陶瓷进行了结构-性能相关性研究，其中 RE=、La 和 Gd，它们都具有弱的掺杂剂-缺陷相互作用，其中 Y- 具有吸引力，La- 具有排斥性， Gd- 为中性。我们采用大信号测量来测量具有不同 RE 浓度的所有 RECO 陶瓷的电致伸缩系数，并表明，具有至少 20% 取代离子浓度的有吸引力的缺陷-掺杂剂相互作用会产生巨大的 M 和 Q 电致伸缩响应。