溶胶凝胶法制备Zn-Si-B-O掺杂钛酸锶钡(Ba0.60Sr0.40TiO3)玻璃陶瓷的制备及其介电性能研究

采用溶胶凝胶方法制备Zn-Si-B-O掺杂Ba0.6Sr0.4TiO3玻璃陶瓷.研究Zn-Si-B-O玻璃组分从5%～50%(摩尔分数,下同)掺杂Ba0.6Sr0.4TiO3玻璃陶瓷的相结构与介电性能.分析Zn-Si-B-O玻璃组分对Ba0.6 Sr0.4TiO3玻璃陶瓷结构及其介电性能的影响.结果表明:Zn-Si-B-O掺杂Ba0.6Sr0.4TiO3玻璃陶瓷的烧结温度低于传统工艺.Zn-Si-B-O掺杂Ba0.6Sr0.4TiO3玻璃陶瓷的相结构为立方钙钛矿相结构(≤40%),不存在第二相.Zn-Si-B-O掺杂Ba 0.6 Sr 0.4TiO3玻璃陶瓷的介电常数ε随着烧结温度升高而增大,介电损耗tanδ随测试温度的增加而降低.Zn-Si-B-O玻璃相聚集在晶粒边界区域,其作用稀释降低了玻璃陶瓷的介电常数,阻止晶粒生长,并降低了介电损耗tanδ.随着晶粒平均尺寸的减小,Zn-Si-B-O掺杂Ba 0.6Sr 0.4TiO3玻璃陶瓷样品的介电峰变低,平坦,宽化的现象.

Preparation and Dielectric Properties of Ba0.60Sr0.40TiO3 Doped Zn-B-Si-O Glass Ceramics by Sol-Gel Method

Preparation and dielectric properties of Ba0.60Sr0.40TiO3 doped Zn-B-Si-O glass ceramics sintered from sol-gel-derived powders were studied.The microstructure and dielectric properties of Zn-Si-B-O doped Ba0.60Sr0.40TiO3ceramics from 5x% to 50X%have been investigated.Effects of Zn-B-Si-O glass contents on the structures and the dielectric characteristics of the Ba0.60Sr0.40TiO3 ceramics were discussed.Experimental results showed that the glass-ceramic samples were sintered at lower temperatures comparing to the conventional barium strontium titanate ceramic.Ba0.60Sr0.40TiO3 glass ceramic samples showed typical XRD patterns of perovskite cubic polycrystalline structure and no secondary phase was detected at Zn-B-Si-O glass addition(≤40x%).The dielectric constant of BST glass ceramic samples generally decreased as the amounts of Zn-B-Si-O glass increased.The dielectric constant of BST glass ceramic samples generally increased and the dielectric loss of BST glass ceramic samples decreased as the sintering temperature increased.The Zn-B-Si-O glass may probably segregate at the grain boundaries,which"dilute"the dielectric constant,hinder the abnormal grain growth,and minimize the dielectric losses.With the decrease of grain size,the dielectric constant maximum peaks of the Ba0.60Sr0.40TiO3doped Zn-B-Si-O glass ceramics become lower and broader.