Leakage Current Characteristics and Magnetic Properties of Gd2O3 Doped BiFeO3 Ceramics

Abstract

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

CLC Number:

TQ174

LIU Xuan, GUO Feifei, LONG Wei, XI Zengzhe, HE Aiguo, XU Guiyu. Leakage Current Characteristics and Magnetic Properties of Gd₂O₃ Doped BiFeO₃ Ceramics[J]. Journal of Synthetic Crystals, 2023, 52(6): 1161-1167.

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Leakage Current Characteristics and Magnetic Properties of Gd₂O₃ Doped BiFeO₃ Ceramics

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