Robust and Tunable Ferroelectricity in Ba/Co Codoped (K_(0.5)Na_(0.5))NbO_(3) Ceramics  

作　　者：刘佳讯 查节林 杨玉龙 吕笑梅 胡雪莉 阎朔 吴子敬 黄凤珍 Jiaxun Liu;Jielin Zha;Yulong Yang;Xiaomei Lu;Xueli Hu;Shuo Yan;Zijing Wu;Fengzhen Huang(National Laboratory of Solid State Microstructures and School of Physics,Nanjing University,Nanjing 210093,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China)

机构地区：[1]National Laboratory of Solid State Microstructures and School of Physics,Nanjing University,Nanjing 210093,China [2]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics Letters》2024年第7期152-160,共9页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China (Grant No.2022YFA1402903);the National Natural Science Foundation of China (Grant Nos.52172116 and 62171214);the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)。

摘　　要：The 0.98(K_(0.5)Na_(0.5))NbO_(3)-0.02Ba(Nb_(0.5)Co_(0.5))O_(3-δ) ceramics with doped Ba^(2+) and Co^(2+) ions are fabricated,and the impacts of the thermal process are studied.Compared with the rapidly cooled (RC) sample,the slowly cooled (SC) sample possesses superior dielectric and ferroelectric properties,and an 11 K higher ferroelectricparaelectric phase transition temperature,which can be attributed to the structural characteristics such as the grain size and the degree of anisotropy.Heat treatment can reversibly modulate the content of the oxygen vacancies,and in turn the ferroelectric hysteresis loops of the samples.Finally,robust and tunable ferroelectric property is achieved in SC samples with good structural integrity.

关 键 词：CERAMICS FERROELECTRIC treatment 

分 类 号：O469[理学—凝聚态物理]