Crystal Structure and Dielectric Properties of Microwave Ceramics CaLa(CaM)O₆ [M = Nb, Sb]

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• 作者：Alo Dutta ; Sanjay Mandal ; Premlata Kumari…
• 关键词：Microwave ceramic ; solid state reaction ; x ; ray diffraction and Raman ; dielectric
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：46
• 期：3
• 页码：1889-1894
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

The dielectric properties of two perovskite oxides CaLa(CaM)O₆ [M = Nb, Sb] synthesized by the solid-state reaction technique have been studied in the microwave and radio frequency range. The phase formation and the crystal structure of the materials are investigated by the Rietveld refinement of the x-ray diffraction data at room temperature. The Raman spectrum substantiates the crystal structure of the materials. The temperature dependence of the relaxation frequencies in the radio frequency range follows the Arrhenius law, and the corresponding activation energies are found to be 0.339 eV and 0.346 eV, respectively, for CaLa(CaNb)O₆ and CaLa(CaSb)O₆. The difference in the values of the dielectric constant and the loss tangent are correlated with the respective crystal structure of the materials.