Distinct microstructure and property evolution of 0.76(Bi_(0.5)Na_(0.5))TiO_(3)-0.24SrTiO_(3) ferroelectric ceramics synthesized with different TiO_(2) reactants  

作　　者：Jian Guo Ji Zhang Jing Wang Shan-Tao Zhang 

机构地区：[1]National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences&Jiangsu Key Laboratory of Artificial Functional Materials&Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]School of Materials Science and Engineering,Nanjing University of Science&Technology,Nanjing 210094,China [3]State Key Laboratory of Mechanics and Control of Mechanical Structures,College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

出　　处：《Journal of Materials Science & Technology》2023年第20期73-79,共7页材料科学技术（英文版）

基　　金：supported by the National Key R&D Program of China(No.2020YFA0711504);the National Natural Science Foundation of China(Nos.12174179,51721001);the Natural Science Foundation of Jiangsu Province(No.BK20221251);the Dengfeng B project of Nanjing University。

摘　　要：Single phase 0.76(Bi_(0.5)Na_(0.5))TiO_(3)–0.24SrTiO_(3) ferroelectric ceramics have been synthesized with homogenous anatase and hierarchical rutile TiO_(2) raw reactants(BNST-A and BNST-R).Either calcined powder persists the microstructure characteristics of raw reactants.As the result,when the sintering temperature increases from 1000 to 1200℃,the average grain size and density of BNST-A increase from 0.49 to 1.48μm and 5.02 to 5.61 g/cm^(3),while those of BNST-R from 0.86 to 1.44μm and 5.37 to 5.61 g/cm^(3).BNST-A illustrates a predominant ergodic relaxor state,and BNST-R prefers a non-ergodic relaxor state,as evidenced by the distinct polarization-electric field loops and current-electric field curves.Especially,such a distinct ferroelectric state is independent of sintering temperature.It is believed that the special hierarchical microstructure of rutile TiO_(2) reactant is beneficial to form denser ceramics with larger grains,and thus suppresses the contributions of polar nanoregions and defect-induced built-in field to ferroelectric property,leading to non-ergodic relaxor state.This work clearly demonstrates the nonnegligible effects of TiO_(2) reactants on the microstructure and properties of BNST ferroelectric ceramics.

关 键 词：BNST ferroelectric ceramics TiO_(2)raw reactants Microstructure and property evolution 

分 类 号：TQ174.1[化学工程—陶瓷工业]