硅酸盐学报

(1–x)Li1.0125MgPO4–xBa3(VO4)2复相陶瓷的制备及其微波介电性能

作者：张梦迪1 陈康1 吕学鹏1 2 郑勇1

单位：(1. 南京航空航天大学材料科学与技术学院南京 210016 2. 南京工程学院材料科学与工程学院南京 211167)

关键词：磷酸锂镁钒酸钡复相陶瓷微波介电性能

分类号：TQ174.75

出版年,卷(期):页码：2019,47(3):0-0

DOI：

摘要：

采用固相烧结法制备(1–x)Li1.0125MgPO4–xBa3(VO4)2复相陶瓷，研究了Ba3(VO4)2掺杂对复相陶瓷相组成、烧结特性、显微组织和微波介电性能的影响。结果表明：(1–x)Li1.0125MgPO4–xBa3(VO4)2陶瓷中仅存在Li1.0125MgPO4和Ba3(VO4)2相。Ba3(VO4)2的添加能明显降低Li1.0125MgPO4陶瓷的烧结温度。随着Ba3(VO4)2含量的增加，复相陶瓷的相对介电常数εr逐渐增大，品质因子Q×f逐渐减小，谐振频率温度系数τf由负值逐渐变为正值。通过调节x值，可获得近零的τf值。0.5Li1.0125MgPO4–0.5Ba3(VO4)2复相陶瓷经875 ℃烧结2 h后具有最佳微波介电性能，即εr=9.72，Q×f=57 347 GHz，τf=−1.9×10−6 /℃，是一种极具潜力的低温共烧介质材料。

Composite ceramics of (1–x)Li1.0125MgPO4–xBa3(VO4)2 were prepared by a conventional solid-state route. The effect of Ba3(VO4)2 doping on the phase composition, sinterability, microstructure and microwave dielectric properties of Li1.0125MgPO4 ceramics was investigated. The results show that (1–x)Li1.0125MgPO4–xBa3(VO4)2 ceramics consist of Li1.0125MgPO4 and Ba3(VO4)2 phases. The addition of Ba3(VO4)2 can reduce the sintering temperature of Li1.0125MgPO4 ceramics. The relative dielectric constant εr of composite ceramics incerases gradually, quality factor Q×f decreases, and the temperature coefficient of resonant frequency τf varies from negative to positive when Ba3(VO4)2 content increases. In addition, a near-zero τf value is obtained via the adjustment of the value of x. The 0.5Li1.0125MgPO4–0.5Ba3(VO4)2 composite ceramic sintered at 875 ℃ for 2 h has excellent microwave dielectric properties (i.e., εr=9.72, Q×f=57 347 GHz, and τf=−1.9×10–6 /℃), which can be used as a promising low temperature co-firing dielectric material.

基金项目：

国家自然科学基金(51674148；51602145)；江苏高校优势学科建设工程资助项目；中央高校基本科研业务费专项资金(NS2016060)资助。

作者简介：

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