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人工晶体学报 ›› 2023, Vol. 52 ›› Issue (6): 1161-1167.

• 研究论文 • 上一篇    下一篇

Gd2O3掺杂BiFeO3陶瓷的漏电流特性及磁性能研究

刘璇1,2, 郭菲菲1, 龙伟1, 惠增哲1, 何爱国1, 徐瑰宇2   

  1. 1.西安工业大学材料与化工学院,陕西省光电功能材料与器件重点实验室,西安 710021;
    2.商洛学院化学工程与现代材料学院,陕西省矿产资源清洁高效转化与新材料工程技术研究中心,商洛 726000
  • 收稿日期:2023-01-04 出版日期:2023-06-15 发布日期:2023-06-30
  • 通信作者: 惠增哲,博士,教授。E-mail:zzhxi@xatu.edu.cn
  • 作者简介:刘 璇(1989—),男,陕西省人,博士研究生,副教授。E-mail:mmjjcs168@qq.com
  • 基金资助:
    国家自然科学基金(51472197,51602242); 陕西省教育厅专项科研项目(21JK0619)

Leakage Current Characteristics and Magnetic Properties of Gd2O3 Doped BiFeO3 Ceramics

LIU Xuan1,2, GUO Feifei1, LONG Wei1, XI Zengzhe1, HE Aiguo1, XU Guiyu2   

  1. 1. Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China;
    2. Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversion and New Materials, School of Chemical Engineering and Modern Materials, Shangluo University, Shangluo 726000, China
  • Received:2023-01-04 Online:2023-06-15 Published:2023-06-30

摘要: 本文采用快速液相烧结法制备了Gd2O3掺杂BiFeO3陶瓷,并对陶瓷样品进行了物相、形貌、漏电流特性和磁性能研究。XRD分析结果表明,Gd2O3的加入促进了富铋相(Bi25FeO40)的形成且使晶胞体积减小,同时陶瓷的物相由三方相向正交相转变;SEM分析结果表明,Gd2O3掺杂能起到细化陶瓷晶粒的作用;电学性能分析表明,陶瓷样品漏电流较大,但Gd2O3的掺杂可显著降低陶瓷的漏电流;漏电流特性分析结果表明,陶瓷在低电场下的漏电流特性是欧姆传导机制,在高电场下纯BiFeO3陶瓷的漏电流特性为肖特基发射机制,但随着Gd2O3掺杂量的增加而逐渐变为空间电荷限制电流传导(SCLC)机制;磁性研究结果表明,掺杂引入的磁性Gd2O3颗粒均匀分布在陶瓷的晶界处从而显著提高陶瓷磁性能。

关键词: BiFeO3陶瓷, Gd2O3掺杂, 液相烧结法, 电学性能, 漏电流特性, 磁性能

Abstract: In this paper, the phase, morphology, leakage current, and magnetic properties of Gd2O3 doped BiFeO3 ceramics prepared by fast liquid-phase sintering method were studied. XRD results show that Gd2O3 doping promotes the formation of a bismuth-rich phase (Bi25FeO40) and reduces the cell volume. At the same time, the phase of the ceramics transforms from three sides to opposite side, and Gd2O3 doping causes the rhombohedral structure distorts and transforms into an orthorhombic structure. SEM analysis shows that Gd2O3 doping can refine the ceramic grains. The analysis of the electrical properties show that the leakage current of ceramic samples is large, but the doping of Gd2O3 can significantly reduce the leakage current. The leakage current characteristic analysis shows that the leakage current characteristic of ceramics under low electric field is ohmic conduction, and the leakage current characteristic of pure BiFeO3 ceramics under high electric field is Schottky emission mechanism, which gradually changes into space charge limited current (SCLC) mechanism with the increase of Gd2O3 doping amount. The magnetic studies show that the magnetic Gd2O3 particles introduced by doping are uniformly distributed in the grain boundaries of ceramics, which significantly improves the magnetic properties of ceramics.

Key words: BiFeO3 ceramics, Gd2O3 doping, liquid-phase sintering method, electrical property, leakage current characteristic, magnetic property

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