采用传统固相反应法制备Bi2(Zn1/3Nb2/3)2O7基陶瓷. 研究Na+、Ni2+分别替代Bi3+、Nb5+对Bi2(Zn1/3Nb2/3)2O7陶瓷烧结特性和介电性能的影响. 替代后样品的烧结温度从960℃降低到870℃左右. 在-30℃~+130℃, 陶瓷样品的温谱中出现明显的介电弛豫现象, 弛豫峰所在温区较宽; 当Ni2+替代量增加到0.2时出现双弛豫峰. 随着Ni2+替代量增加, 弛豫峰值温度向高温移动, 弛豫激活能增加, 两弛豫峰之间距增加. 用缺陷偶极子和晶格畸变解释了Na-Ni掺杂Bi2(Zn1/3Nb2/3)2O7的介电弛豫现象.
Bi2(Zn1/3Nb2/3)2O7 based ceramics were prepared by a traditional solid phase reaction method. The effects of substitution Na+ for Bi3+ and Ni2+ for Nb3+ on the sintering and dielectric properties of Bi2(Zn1/3Nb2/3)2O7 based ceramics were investigated. The sintering temperature of the substituted samples dropped to 870℃ from 960℃. At -30℃-+130℃, the dielectric relaxation peak with a broad temperature region is obviously observed and two relaxation peaks appear when the substitution of Ni2+ reaches 0.2. Then, with the increasing of substitution, the temperature of the permittivity maximum shifts to higher temperature and the activation energy involved in the relaxation processes increases and the distance between two relaxation peaks become longer. Defect dipole and distortion of crystal lattice theories are used to explain the dielectric relaxation of Na-Ni doped Bi2(Zn1/3Nb2/3)2O7 ceramics.
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