Ba_(0.9)La_(0.1)Ti_(0.9)Fe_(0.1)O_(3)陶瓷的介电弛豫研究  

Study on Dielectric Relaxation of Ba_(0.9)La_(0.1)Ti_(0.9)Fe_(0.1)O_(3)Ceramic

作　　者：刘军伟[1] 刘巧丽[1] 王辰[1] 徐兴组 路大勇[1] LIU Junwei;LIU Qiaoli;WANG Chen;XU Xingzu;LU Dayong(Key Laboratory for Special Functional Materials in Jilin Provincial Universities,Jilin Institute of Chemical Technology,Jilin 132022,China)

机构地区：[1]吉林化工学院吉林省特种功能材料重点实验室,吉林吉林132022

出　　处：《有色金属工程》2021年第3期16-20,共5页Nonferrous Metals Engineering

基　　金：吉林省教育厅科学技术研究项目(JJKH20200236KJ,JJKH20200248KJ);吉林省发改委项目(2019C044-1)。

摘　　要：利用固相反应法制备了La/Fe双掺杂BaTiO3陶瓷Ba_(0.9)La_(0.1)Ti_(0.9)Fe_(0.1)O_(3),利用X射线衍射(XRD)、扫描电子显微镜(SEM)和变温变频介电测试对陶瓷的结构和介电性质进行了分析。XRD结果表明,10%的La/Fe离子能够完全并入BaTiO_(3)主晶格,形成立方晶体结构。变频介电常数呈现明显的介电平台,并在损耗谱中出现弛豫峰,同时具有热激活特征。弛豫峰位与温度在高温区域符合Arrhenius关系,在低温范围内表现为极化子弛豫行为。电模量谱表明Ba_(0.9)La_(0.1)Ti_(0.9)Fe_(0.1)O_(3)具有晶粒和晶界两种电学结构,高频弛豫峰与晶粒相关,低频弛豫峰与晶界有关。巨介电常数和介电弛豫是晶界空间电荷极化和晶粒内部电荷运动共同作用的结果。La/Fe co-doped BaTiO3 ceramic Ba_(0.9)La_(0.1)Ti_(0.9)Fe_(0.1)O_(3)was prepared by solid-state reaction method.The structure and dielectric properties were characterized by XRD,SEM and dielectric spectroscopy.The XRD pattern indicates that 10%La and Fe ions can enter the BaTiO_(3) lattice and form cubic structure.The frequency-dependent dielectric constant exhibits plateaus in different frequency ranges,and dielectric relaxation peaks,which showing thermal-activated characteristic,are observed in loss plots.The relaxation obeys the Arrhenius relationship in high-temperature range and adopts a polaron relaxation behavior in low-temperature range.The electric modulus spectra suggest grain and grain boundary with different properties exist.The high-frequency relaxation in electric modulus is related to grain,while the low-frequency relaxation is related to grain boundary.The colossal dielectric constant and relaxation are a result of interactive effect of space-charge polarization in grain boundary and charge transport in grain interior.

关 键 词：双掺杂钛酸钡 巨介电常数 介电弛豫 电模量 

分 类 号：O487[理学—固体物理] TB34[理学—物理]