Improved dielectric properties of (Bi_1.5Zn_0.5)(Zn_0.5Nb_1.5)O₇ by the substitution of Zn²⁺ on the A site based on the structure characteristics

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• 作者：Lingxia Li ; ^{lilingxia91@163.com" class="auth_mail} ; Yuxin Jin ; Ping Zhang
• 关键词：C. Dielectric properties ; BZN ceramics ; Low sintering ; Structural characteristics
• 刊名：Ceramics International
• 出版年：August 2014
• 年：2014
• 卷：40
• 期：7
• 页码：10601-10606
• 全文大小：1386 K

文摘

(Bi_1.5Zn_0.5−xMg_x)(Zn_0.5Nb_1.5)O₇ (x=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 Mg²⁺ 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_1.5Zn_0.5)(Zn_0.5Nb_1.5)O₇ phase. The shift of the peaks can be demonstrated by changing the unit cell volumes caused by the substitution of ions. The dielectric constant 蔚_r was related to the relative density. The bond valence of (Bi_1.5Zn_0.5−xMg_x)(Zn_0.5Nb_1.5)O₇ ceramics was calculated to evaluate the relationship between the temperature coefficient of the dielectric constant 蟿_蔚 and the structural characteristics of the B site ion. The loss tangent tan未 was mainly affected by the densities and grain size. The (Bi_1.5Zn_0.5−xMg_x)(Zn_0.5Nb_1.5)O₇ 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.