中文摘要：

采用微波水热法合成了纳米晶钛酸锶钡（Ba0.6 Sr0.4 TiO2，简称BST）粉体，并将粉体烧结成陶瓷，对样品的介电性能进行了测试，研究分析了材料的介电性能，并与传统制备工艺获得的样品进行了性能上的对比，实验结果表明：微波水热法获得的BST粉体较细，其合成温度和烧结成瓷温度较传统制备工艺大幅降低，分别为195℃和1230℃，可以获得晶粒尺寸在3μm以下的陶瓷。随着晶粒的减小，BST陶瓷的相对介电常数和介电损耗降低，尤其是介电损耗因子有较大幅度降低。

英文摘要：

Ba0.6 Sr0.4 TiO3 （BST） nanopowders were prepared by microwave hydrothermal（MH） synthesis, and then the a-sintered samples＂ dielectric properties were tested and compared with the same compositional material prepared bY conventional processing（CP）. The results show that the synthetic temperature of BST powder reduced from CP＇s 1 100 ℃ to MH synthesis’ 195℃ , and the BST ceramic（by MH route） with fine grain （〈3 μm） can he obtained by sintering at 1 230 ℃ for 2 h. With the decrease of grain size, the BST ceramics＇ relative dielectric constant and dielectric loss reduce, and especially their dielectric loss factor reduces greatly.