Microscopic Calculation of Dielectric Loss at Microwave Frequencies for Complex Perovskite Ba(Zn1/3Ta2/3)O3
Microscopic Calculation of Dielectric Loss at Microwave Frequencies for Complex Perovskite Ba(Zn1/3Ta2/3)O3
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DOI：
10.1111/j.1151-2916.1992.tb05613.x
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发表时间：
1992-09
影响因子：
3.9
通讯作者：
D. A. Sagala;S. Nambu
中科院分区：
文献类型：
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作者：
D. A. Sagala;S. Nambu
计算了复合钙钛矿Ba（Zn 1/3 Ta 2/3）O3在微波频率下的介电损耗角正切与B位结构无序度的关系。从离子运动方程出发，用与Zn和Ta离子在B位上的排列相对应的对相关函数表示介电损耗。对相关函数中包含的特征长度对应于B位离子排列无序区域的平均尺寸，从而从理论上阐明了B位结构无序与微波频率下介电损耗角正切之间的关系。数值计算结果表明，随着有序度的增加，B位的微波损耗角正切值在-3 ~-6之间变化，这与实验结果吻合较好。这里得到的结果证实了复合钙钛矿Ba（Zn 1/3 Ta 2/3）O3的微波损耗的物理起源。
The dielectric loss tangent at microwave frequencies for the complex perovskite Ba(Zn1/3Ta2/3)O3 was calculated with respect to the degree of structural disorder on B sites. Starting out from the equations of ion motion, dielectric loss was expressed in terms of the pair-correlation functions corresponding to the ordering of Zn and Ta ions on B sites. The characteristic length included in the pair-correlation functions corresponds to the average size of the region containing disorder in ion arrangements on B sites; thus the relation between the structural disorder on the B site and the dielectric loss tangent at microwave frequencies was clarified theoretically. The numerical results show that the microwave loss tangent values change their power from – 3 to – 6 with increasing degree of order on the B site, which agrees well with the experimental observations. Results obtained here confirm the physical origin of the microwave loss of complex perovskite Ba(Zn1/3Ta2/3)O3.