Crystal structure and microwave dielectric properties of a new A₄B₃O₁₂-type cation-deficient perovskite Ba₃LaTa₃O₁₂

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• 作者：Hui Zhang ; Yanmei Wu ; Sensen Meng ; Liang Fang
• 关键词：Ceramics ; Solid-state reaction ; Crystal structure
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：28 July 2008
• 卷：460
• 期：1-2
• 页码：460-463
• 文件大小：495 K

摘要

A new microwave dielectric ceramic Ba₃LaTa₃O₁₂ has been prepared by conventional solid-state ceramic route. Through Rietveld refinement of X-ray powder diffraction data, the compound is identified as an A₄B₃O₁₂-type B-site cation-deficient perovskite with space group he/MiamiImageURL/B6TWY-4NWCDBG-3-C/0?wchp=dGLbVtb-zSkWW" alt="View the MathML source" title="View the MathML source" align="absbottom" border="0" height=14 width="32"/> and lattice constants a = 5.7573(2) Å, c = 28.2386(2) Å, V = 810.62(4) ų and Z = 3. The microwave dielectric properties of Ba₃LaTa₃O₁₂ were investigated. The compound exhibits a relative dielectric constant (_r) of 36.8, a quality factor Q_u × f of 21,965 at 6.4040 GHz and a small negative temperature coefficient of resonant frequency (τ_f) of −49.6 ppm/°C.