低温环境下PbTiO_(3)钙钛矿晶粒的演化过程  

Evolution process of PbTiO_(3)perovskite grains under low temperature environment

作　　者：于海涛 陈国新[1] 吴海辰 梁芮 卢焕明[1] YU Haitao;CHEN Guoxin;WU Haichen;LIANG Rui;LU Huanming(Ningbo Institute of Materials Technology and Engineering,CAS,NingbO_(3)15201,China)

机构地区：[1]中国科学院宁波材料技术与工程研究所,宁波315201

出　　处：《理化检验（物理分册）》2024年第5期1-3,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：浙江省基础公益研究计划项目(LGC21E020002)。

摘　　要：利用透射电子显微镜研究了PbTiO_(3)钙钛矿在低温条件下的晶体结构及晶粒演化过程。结果表明:低温条件下,PbTiO_(3)钙钛矿未出现明显的相转变;在电子束辐照条件下,PbTiO_(3)晶体出现细晶化现象,说明电子束对其结构变化存在诱导作用;在室温和低温环境下,PbTiO_(3)晶体均未产生位错缺陷,且低温环境使晶粒细化过程变慢;电子辐照作用使材料的表面能变大,导致晶粒尺寸变小,从而出现细晶化现象。The crystal structure and grain evolution process of PbTiO_(3)perovskite under low temperature conditions were studied using transmission electron microscopy.The results show that under low temperature conditions,there was no significant phase transition in PbTiO_(3)perovskite.Under electron beam irradiation conditions,PbTiO_(3)crystals exhibited fine-grained phenomena,indicated that the electron beam had an inducing effect on their structural changes.At room temperature and low temperature,PbTiO_(3)crystals did not produce dislocation defects,and the low temperature environment slowed down the grain refinement process.The effect of electron irradiation increased the surface energy of materials,led to a decrease in grain size and resulted in the phenomenon of fine crystallization.

关 键 词：PbTiO_(3)钙钛矿 透射电子显微镜 细晶化现象 相变 表面能 

分 类 号：TB32[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]