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放电等离子体烧结BaTiO3-xBi(Ni0.5Zr0.5)O3陶瓷的介电和阻抗性能

XIAO Changjiang,MA Jinming,ZHANG Qunfei

Journal of Materials Engineering（2024）

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Abstract
采用传统固相反应法合成BaTiO3-xBi(Ni0.5Zr0.5)O3粉体和放电等离子体烧结技术制备BaTiO3-xBi(Ni0.5Zr0.5)O3陶瓷,研究陶瓷的晶体结构、微观形貌、介电和阻抗性能.结果表明:BaTiO3-0.10Bi(Ni0.5Zr0.5)O3陶瓷具有钙钛矿型,晶体结构为赝立方相,晶粒尺寸约为0.64μm,密度为5.81 g/cm3,最大介电常数为7149,且随频率升高相变温度向高温移动.在1 kHz下,BaTiO3-0.10Bi(Ni0.5Zr0.5)O3陶瓷的ln(1/ε-1/εm)与ln(T-Tm)的拟合曲线斜率为1.61,在-41～169℃内,Δε/ε25℃≤±15％,表明样品有良好的温度稳定性.此外,随温度和频率的升高,材料的阻抗降低,在50℃下,当频率为100 Hz时,电阻为2.33×106Ω,离子电导率为10-8 S/cm.
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Key words
BaTiO3-xBi(Ni0.5Zr0.5)O3,spark plasma sintering,pseudo-cubic phase,dielectric property,relaxation characteristic,impedance
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