Sb2O3掺杂BiFeO3-BaTiO3压电陶瓷的结构及电性能研究

摘要/Abstract

摘要： 采用传统固相烧结法合成了0.7BiFeO₃-0.3BaTiO₃+x%Sb₂O₃(质量分数)陶瓷(BFO-BTO+xSb, x=0.00~0.20),研究了Sb₂O₃掺杂对BFO-BTO陶瓷的晶相结构、介电、导电以及压电和铁电性能的影响,并对影响机理进行探讨。结果表明:Sb掺杂导致陶瓷的晶体结构由伪立方相向菱形相转化。Sb的B位取代增加了BFO-BTO+xSb陶瓷的铁电弛豫性,降低高温损耗,并使居里温度T_c有所降低。导电特性的研究表明,Sb掺杂改变了$V_O^×$和Fe²⁺的浓度,降低了电导率,但没有改变陶瓷的导电机制,其主要载流子是氧空位。Sb掺杂量x=0.05时,BFO-BTO+xSb陶瓷表现出最佳的综合电性能:d₃₃=213 pC/N,k_p=28.8%,Q_m=38,T_c=520 ℃,P_r =24.7 μC/cm²。

关键词: BiFeO₃-BaTiO₃, Sb₂O₃掺杂, 固相烧结法, 介电性能, 压电性能, 弛豫特性

Abstract: 0.7BiFeO₃-0.3BaTiO₃+x%Sb₂O₃ (mass fraction) ceramics (BFO-BTO+xSb, x=0.00~0.20) were synthesized by the conventional solid state reaction method, and the effect of Sb₂O₃ doping on the crystalline phase structure, dielectric, conductive, piezoelectric and ferroelectric properties of BFO-BTO ceramics was investigated, along with doping mechanism. The results indicate that Sb doping change the crystal structure from a pesodocubic lattice to a rhombohedral lattice. Sb substitution for B site increases ferroelectric relaxation, decreases dielectric loss at high temperature, and also lowers the Curie temperature. The conductive characteristics demonstrate that Sb doping changes the concentration of $V_O^×$ and Fe²⁺, and decreases the conductivity, without changing the conductive mechanism with oxygen vacancy as the dominant carrier. BFO-BTO+xSb ceramics exhibit optimum electric properties at x=0.05: d₃₃=213 pC/N, k_p=28.8%, Q_m=38, T_c=520 ℃, P_r=24.7 μC/cm².

Key words: BiFeO₃-BaTiO₃, Sb₂O₃ doping, solid state method, dielectric property, piezoelectric property, relaxation behavior

中图分类号:

TM282

黄志强, 何秀将, 何新华, 符小艺, 王歆, 卢振亚. Sb₂O₃掺杂BiFeO₃-BaTiO₃压电陶瓷的结构及电性能研究[J]. 人工晶体学报, 2021, 50(3): 565-571.

HUANG Zhiqiang, HE Xiujiang, HE Xinhua, FU Xiaoyi, WANG Xin, LU Zhenya. Structure and Electrical Properties of Sb₂O₃-Doped BiFeO₃-BaTiO₃ Piezoelectric Ceramics[J]. Journal of Synthetic Crystals, 2021, 50(3): 565-571.

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Sb₂O₃掺杂BiFeO₃-BaTiO₃压电陶瓷的结构及电性能研究

Structure and Electrical Properties of Sb₂O₃-Doped BiFeO₃-BaTiO₃ Piezoelectric Ceramics

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