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首页> 外文期刊>CERAMICS INTERNATIONAL >Improved dielectric properties of (Bi_(1.5)Zn_(0.5))(Zn_(0.5)Nb_(1.5))O_7 by the substitution of Zn~(2+) on the A site based on the structure characteristics
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Improved dielectric properties of (Bi_(1.5)Zn_(0.5))(Zn_(0.5)Nb_(1.5))O_7 by the substitution of Zn~(2+) on the A site based on the structure characteristics

机译：通过基于结构特征的A位上的Zn〜（2+）取代，改善（Bi_（1.5）Zn_（0.5））（Zn_（0.5）Nb_（1.5））O_7的介电性能

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摘要

(Bi_(1.5)Zn_(0.5-x)Mg_x)(Zn_(0.5)Nb_(1.5)O_7 (z=0.0, 0.1, 0.2, 0.3, 0.4) dielectric ceramics with improved dielectric properties were prepared by a conventional mixed oxide route. The effects of Mg~(2+) ion substitution on the microstructures and dielectric properties based on structural characteristics in this system were investigated systematically. Rietveld refinement was used to analyze the structural change of the sintered samples. Microscopic analysis showed that all of the samples maintained the (Bi_(1.5)Zn_(0.5))(Zn_(0.5)Nb_(1.5))O_7 phase. The shift of the peaks can be demonstrated by changing the unit cell volumes caused by the substitution of ions. The dielectric constant ε_r was related to the relative density. The bond valence of (Bi_(1.5)Zn_(0.5)Mg_x)(Zn_(0.5)Nb_(1.5)O_7 ceramics was calculated to evaluate the relationship between the temperature coefficient of the dielectric constant τ_ε and the structural characteristics of the B site ion. The loss tangent tanδ was mainly affected by the densities and grain size. The (Bi_(1.5)Zn_(0.5-x)Mg_x)(Zn_(0.5)Nb_(1.5))O_7 ceramics with improved dielectric properties were obtained at a low sintering temperature of 950 °C, which could be a promising candidate for low temperature co-fired ceramics (LTCC) and multilayer components applications in high frequency and microwave range.
机译：通过常规的混合氧化物路线制备具有改善的介电性能的（Bi_（1.5）Zn_（0.5-x）Mg_x）（Zn_（0.5）Nb_（1.5）O_7（z = 0.0，0.1，0.2，0.3，0.4）介电陶瓷系统地研究了Mg〜（2+）离子取代对基于结构特征的微结构和介电性能的影响，并利用Rietveld精炼法分析了烧结后样品的结构变化。样品保持（Bi_（1.5）Zn_（0.5））（Zn_（0.5）Nb_（1.5））O_7相。峰的移动可以通过改变由离子取代引起的晶胞体积来证明。介电常数ε_r与相对密度有关，计算（Bi_（1.5）Zn_（0.5）Mg_x）（Zn_（0.5）Nb_（1.5）O_7陶瓷的键合价，以评价介电常数τ_ε的温度系数与B位离子的结构特征，损耗角正切tanδ为主要受密度和晶粒尺寸的影响。在950°C的低烧结温度下获得了具有改善的介电性能的（Bi_（1.5）Zn_（0.5-x）Mg_x）（Zn_（0.5）Nb_（1.5））O_7陶瓷，这可能是低烧结温度的有希望的候选者高温和微波范围内的高温共烧陶瓷（LTCC）和多层组件的应用。

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