钛酸锶钡-氧化锌复合陶瓷的结构与介电性能

Structure and dielectric properties of barium strontium titanate-zinc oxide composite ceramics

分别采用熔盐法和固相反应法预制的Ba0.85Sr0.15TiO3（BST）粉体,制备了BST-ZnO复合陶瓷。对陶瓷的晶相组成、微观形貌特征及介电性能进行了研究。结果表明,BST-ZnO复合陶瓷微观结构及介电性能受BST粉体性质的影响显著。以熔盐法预制BST粉体时,陶瓷的ZnO晶粒显著长大,其εr可达104量级。而以固相反应法预制BST粉体时,陶瓷的ZnO晶粒较小。当r（BST：ZnO）=0.4时产生纤维状ZnO晶粒,并在16-20℃附近出现与BST材料相似的相变特征。

Barium strontium titanate-zinc oxide composite ceramics were prepared using Ba0.85Sr0.15TiO3（BST） powders which were synthesized via the solid-state reaction method and the molten salt method. The crystal phase composition, the microstructure and the dielectric properties of the ceramics were studied. The results indicate that the microstructure and the dielectric properties of the ceramics are obviously affected by the properties of BST powders. When the ceramics are prepared using the BST powders synthesized via the molten salt method, the grain size of ZnO is 5 μm and the relative permittivity of the ceramics reach up to 104 order of magnitude. When the ceramics are prepared using the BST powders synthesized via the solid-state reaction method, the grain size of ZnO is smaller. And fiber-like ZnO grains are observed when the mole ratio of BST to ZnO is 0.4. The phase transition characteristic which is similar to that of BST materials is also observed near 16~20 ℃.