Broadband and Microwave Dielectric Studies on Ba₅Nb₄O₁₅ Ceramics Supplemented with Its Nanoparticles for Cryogenic Electronic Applications

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• 作者：C. Anil Kumar ; D. Pamu
• 关键词：BNO ceramics ; sol–gel process ; impedance spectroscopy ; broadband and microwave dielectric properties
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：46
• 期：2
• 页码：917-928
• 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

Ba₅Nb₄O₁₅ (BNO) nanopowders were prepared by sol–gel process. The effect of BNO nanopowders (x = 1 wt.%, 2 wt.%, and 3 wt.%) on micron-sized BNO polycrystalline powders were studied systematically. Transmission electron microscope (TEM) images of BNO nanoparticles revealed spherical and cylindrical shapes with average particle sizes of 45 nm and 60 nm, respectively. Further, the dielectric response of BNO ceramics with x wt.% of nanosized particles (x = 1–3) measured in the temperature range of 80°C to 200°C showed relaxation behaviour and is described by using Havriliak–Negami equation. The best microwave dielectric properties of ε_r and Q × f₀ values of 39.2 GHz and 59,000 GHz, at 6.52 GHz are obtained for the x = 3 wt.% sample, sintered at 1100°C, and is attributed to maximum density, large and uniform microstructure. The acquired static dielectric response of BNO ceramics with x wt.% of nanosized particles (x = 1–3) are suitable for cryogenic electronic and dielectric resonator applications.