采用热压烧结法制备了Al2O3/LiTaO3 (ALT) 陶瓷复合材料, 研究了Al2O3不同体积含量(5vol%、10vol%、15vol%和20vol%)对LiTaO3压电陶瓷介电性能的影响. 结果表明：随着频率的增加, 不同Al2O3含量的ALT陶瓷复合材料的介电常数和介电损耗均降低, 但降低的幅度不同. 少量Al2O3(5vol%)的添加既能增大材料的介电常数同时又降低了材料的介电损耗, 但是随着Al2O3含量的继续增加, ALT陶瓷复合材料的介电常数和介电损耗都增大, 其居里温度先升高后降低. Al2O3作为第二相不但能促进LiTaO3陶瓷烧结致密，而且对ALT陶瓷复合材料的介电性能也有提高.
The effect of Al2O3 addition (5vol%, 10vol%, 15vol% and 20 vol%) on the dielectric properties of Al2O3/LiTaO3(ALT) composite ceramics prepared by hot-press sintering were investigated. The results show that the dielectric constant and dielectric loss of ALT composite ceramics decrease with the increasing frequency. Comparing with pure LiTaO3 ceramics, adding 5vol% Al2O3 can increase its dielectric constant and decrease its dielectric loss, while the dielectric constant and dielectric loss of ALT composite ceramics increase consequently with more Al2O3 adding. With Al2O3 contents increasing, the Curie temperature initiately increases and then decreases, reaching the maximum at 5vol% Al2O3. Thus, Al2O3/LiTaO3(ALT) composite ceramics is a good composite system because the addition of the second phase Al2O3 promotes sintering of LiTaO3, and slightly improves its dielectric properties.
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