水热法合成陶瓷LaPO4的微波介电性能

doi:10.15541/jim20150016

摘要/Abstract

摘要：

通过水热法和固相反应法制备了LaPO₄粉体, 分别在1030~1340℃和1300~1460℃范围内对粉体进行了烧结, 得到了LaPO₄陶瓷, 研究对比了两种方法得到的陶瓷的烧结行为和微波介电性能。结果表明: 和固相法相比, 水热法得到的陶瓷由于粉体粒径小更易于烧结, 微波介电性能更优;在1260℃条件下烧结2 h得到的水热法陶瓷具有最好的微波介电性能: 介电常数为10.2, Q×f值为129704 GHz (f = 10.2 GHz), 谐振频率温度系数值为-58.6 ppm/℃;水热法陶瓷的Q×f值为固相法的2.47倍, 烧结温度比固相法低140℃。

关键词: 微波介电性质, 水热合成, LaPO4, 烧结性

Abstract:

Lanthanum orthophosphate (LaPO₄) ceramics were obtained by using hydrothermal prepared powders and solid-state reaction prepared powders in a sintering temperature range of 1030-1340℃ and 1300-1460℃, respectively. The sintering and microwave dielectric properties of hydrothermal processed LaPO₄ ceramics were compared with those of solid-state reaction processed LaPO₄. The results showed that hydrothermal processed LaPO₄ had a higher sinterability and better microwave dielectric properties due to its much finer particle size when compared with solid-state reaction processed LaPO₄. The best microwave dielectric properties of the hydrothermal processed LaPO₄ ceramics were obtained when the ceramics sintered at 1260℃ for 2 h with a permittivity~10.2, a Q×f value about 129704 GHz (at 10.2 GHz) and a temperature coefficient value of -58.6×10^-6/℃. The Q×f value of hydrothermal processed LaPO₄ ceramics was 2.47 times greater than that of solid-state reaction processed LaPO₄ ceramics, while the sintering temperature of the former was 140℃ lower than that of the latter in the literature.

Key words: microwave dielectric properties, hydrothermal synthesis, lanthanum orthophosphate, sintering behavior

中图分类号:

TQ174

谢会东, 李飞, 陈超, 席海红, 史玲. 水热法合成陶瓷LaPO₄的微波介电性能[J]. 无机材料学报, 2015, 30(8): 882-886.

XIE Hui-Dong, LI Fei, CHEN Chao, XI Hai-Hong, SHI Ling. Microwave Dielectric Properties of LaPO₄ Ceramics Synthesized by a Hydrothermal Method[J]. Journal of Inorganic Materials, 2015, 30(8): 882-886.

图/表 5

Fig. 1 TEM, high-resolution TEM images and EDAX spectrum of the H-LaPO4 powders (a) TEM images; (b) High-resolution TEM images; (c) EDAX spectrum

Fig. 2 XRD patterns of the LaPO4 powders and ceramics

Fig. 3 SEM images of fractured surfaces of the H-LaPO4 ceramics sintered at different temperatures (a) 1140℃; (b) 1180℃; (c) 1220℃; (d) 1260℃; (e) 1300℃; (f) 1340℃

Fig. 4 Relative densities of H-LaPO4 ceramics and SSR-LaPO4 ceramics

Fig. 5 Microwave dielectric properties (permittivity, Q×f value) of H-LaPO4 ceramics and SSR-LaPO4 ceramics as a function of sintering temperature (a) H-LaPO4 ceramics; (b) SSR-LaPO4 ceramics

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水热法合成陶瓷LaPO₄的微波介电性能

Microwave Dielectric Properties of LaPO₄ Ceramics Synthesized by a Hydrothermal Method

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