Synthesis and microwave dielectric properties of pseudobrookite-type structure Mg₅Nb₄O₁₅ ceramics by aqueous sol-gel technique

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• 作者：H.T. Wu ; ^{mse_wuht@ujn.edu.cn} ; W.B. Wu ; Y.L. Yue ; Y.M. Chen ; F. Yang
• 关键词：A. Sol&ndash ; gel processes ; Mg5Nb4O15 ; Nanopowder synthesis ; Microwave dielectric properties
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：4271-4276
• 文件大小：1027 K

摘要

Pseudobrookite-type Mg₅Nb₄O₁₅ ceramics were prepared by aqueous sol-gel process and microwave dielectric properties were investigated. Highly reactive nanosized Mg₅Nb₄O₁₅ powders were successfully synthesized at 600 掳C in oxygen atmosphere with particle sizes of 20-40 nm firstly and then phase evolution was detected by DTA-TG and XRD. Sintering characteristics and microwave dielectric properties of Mg₅Nb₄O₁₅ ceramics were studied at different temperatures ranging from 1200 掳C to 1400 掳C. With the increase of sintering temperature, density, 蓻_r and Q路f values increased, and then saturated at 1300 掳C. Excellent microwave properties of 蓻_r 鈭?1.3, Q路f 鈭?3,300 GHz and 蟿_f 鈭尖垝58 ppm/掳C, were obtained finally. The sintering temperature of Mg₅Nb₄O₁₅ ceramics was significantly reduced by aqueous sol-gel process compared to conventional solid-state methods.