微波介电特性与晶体结构的关系分析

Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002. Pub Date : 2002-05-28 DOI:10.1109/ISAF.2002.1195874

H. Ohsato, A. Kan, K. Kakimoto, H. Ogawa, S. Nishigaki

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引用次数: 0

摘要

在分析两种体系晶体结构的基础上，讨论了微波介电特性、质量因子、介电常数和谐振频率温度系数。以Ba/sub - 6-3x/R/sub - 8+2x/Ti/sub - 18/O/sub - 54/ (R =稀土)固溶体和Y/sub - 2/BaCuO/sub - 5/ green相为例。通过相变、阳离子的组份排序和对组份进行净化，提高了质量因子Q/spl middot/f。介电常数(/spl epsiv//sub r/)受阳离子多面体体积、TiO/sub 6/八面体倾斜度和阳离子极化率的影响。通过对不同温度下晶体结构的分析，研究了谐振频率的温度系数。

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Microwave dielectric properties correlated to crystal structure: an analysis

Microwave dielectric properties, quality factor, dielectric constant and temperature coefficient of resonant frequency, are discussed based on the crystal structure analysis of two systems. The tungstenbronze-type like Ba/sub 6-3x/R/sub 8+2x/Ti/sub 18/O/sub 54/ (R = rare earth) solid solutions and Y/sub 2/BaCuO/sub 5/ green phase are addressed as examples. The quality factor (Q/spl middot/f) is improved by ordering due to phase transformation, compositional ordering of cations and purifying the composition. Dielectric constant (/spl epsiv//sub r/) is affected by volume of cation polyhedron, tilting of TiO/sub 6/ octahedron and polarizability of cations. Temperature coefficients of resonant frequency is studied by crystal structural analysis with different temperature.

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002.

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