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℃。
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, aQ×f value about 129704 GHz (at 10.2 GHz) and a temperature coefficient value of –58.6×10-6/℃. TheQ×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.
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