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有色金属工程:2021,(3):-
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Ba0.9La0.1Ti0.9Fe0.1O3陶瓷的介电弛豫研究
刘军伟, 刘巧丽, 王辰, 徐兴组, 路大勇
(吉林化工学院 吉林省特种功能材料重点实验室)
Study on Dielectric Relaxation of Ba0.9La0.1Ti0.9Fe0.1O3 Ceramic
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)
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投稿时间:2020-08-18    修订日期:2020-08-27
中文摘要: 利用固相反应法制备了La/Fe双掺杂BaTiO3陶瓷Ba0.9La0.1Ti0.9Fe0.1O3,利用X射线衍射(XRD)、扫描电镜(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BaTiO3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Ba0.9La0.1Ti0.9Fe0.1O3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。
Abstract:La/Fe co-doped BaTiO3 ceramic Ba0.9La0.1Ti0.9Fe0.1O3 was prepared by solid-state reaction method. The structure and dielectric properties were examined by XRD, SEM and dielectric spectroscopy. The XRD result indicates that 10% La and Fe ions can enter the BaTiO3 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.
文章编号:     中图分类号:O487; TB34    文献标志码:
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刘军伟,刘巧丽,王辰,徐兴组,路大勇.Ba0.9La0.1Ti0.9Fe0.1O3陶瓷的介电弛豫研究[J].有色金属工程,2021,(3):.

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