Dielectric properties of lanthanum substituted barium titanate microwave ceramics

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• 作者：Sukhleen Bindra Narang ; Dalveer Kaur and Shalini Bahel
• 关键词：Ceramics ; X-ray diffraction (XRD) ; Dielectrics ; Tangent loss ; a.c. conductivity
• 刊名：Materials Letters
• 出版年：2006
• 出版时间：November 2006
• 年：2006
• 卷：60
• 期：25-26
• 页码：3179-3182
• 全文大小：315 K

文摘

In this study, we report the high dielectric constant lanthanum substituted barium titanate ceramic material for its possible applications at microwave frequencies. The microwave dielectric characterization of Ba_{6 − 3x}La_{8 + 2x}Ti₁₈O₅₄ solid solutions with 0.0 ≤ x ≤ 0.7 prepared by conventional mixed oxide route method has been carried out. The lattice parameters were obtained from the X-ray diffraction patterns. It was observed that lattice parameters increased with respect to an increase in the ‘La’ content. The crystal symmetry investigated was orthorhombic with space group of Pbam. From the evaluation of microwave dielectric properties of lanthanum doped barium titanate ceramics, it was observed that a maximum value of dielectric constant (ε′) = 157 and a minimum tangent loss (tanδ) = 0.0572 was obtained. The minimum value of a.c. conductivity (σ_a.c.) was observed to be 1.76e − 07 S/m.