CAJ | 학술논문

分别采用熔盐法和固相反应法预制的Ba_(0.85)Sr_(0.15)TiO_3(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ε_r可达10~4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.
분별채용용염법화고상반응법예제적Ba_(0.85)Sr_(0.15)TiO_3(BST)분체,제비료BST-ZnO복합도자.대도자적정상조성、미관형모특정급개전성능진행료연구.결과표명,BST-ZnO복합도자미관결구급개전성능수BST분체성질적영향현저.이용염법예제BST분체시,도자적ZnO정립현저장대,기ε_r가체10~4량급.이이고상반응법예제BST분체시,도자적ZnO정립교소.당r(BST:ZnO) = 0.4시산생섬유상ZnO정립,병재16～20 ℃부근출현여BST재료상사적상변특정.
Barium strontium titanate-zinc oxide composite ceramics were prepared using Ba_(0.85)Sr_(0.15)TiO_3(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 10~4 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 ℃.