(桂林电子科技大学 信息材料科学与工程系，桂林 541004)
摘 要: 采用传统固相烧结法，以化学纯BaCO3，SrCO3，Nb2O5和SnO2粉末为原料，制备0.7BaO·0.3SrO·ySnO2·(1− y/2)Nb2O5(y=0.01~0.07，缩写为SBNS)陶瓷。利用X射线衍射仪、扫描电子显微镜和阻抗分析仪研究掺杂SnO2对SBNS陶瓷的显微结构和介电性能的影响。结果表明：在1 320 ℃烧结可获得致密SBNS陶瓷；SnO2掺杂对SBNS陶瓷相结构无影响，晶相仍为单一的四方钨青铜固熔体结构；随着SnO2掺杂量的增加，SBNS陶瓷的介电常数减小，居里温度向低温区移动；SBNS陶瓷具有弥散相变的特性，是典型的介电弛豫体。
关键字: 铌酸锶钡陶瓷；介电性能；弥散相变；微结构
SBNS ceramics doped with SnO2
（Department of Information Materials Science and Engineering, Guilin University of Electronic Technology,
Guilin 541004, China）
Abstract: 0.7BaO∙0.3SrO∙ySnO2∙(1−y/2)Nb2O5 (abbreviated as SBNS) ceramics were prepared from BaCO3, SrCO3, SnO2 and Nb2O5 powders by traditional solid-state sintering method. The effects of tin concentration on the microstructure and dielectric properties of SBNS ceramics were investigated by X-ray diffractometry, scanning electric microscopy and dielectric property measurements. The results show that the dense and single phase tetragonal tungsten bronze (TTB) SBNS ceramics can be obtained when sintered at 1 320 ℃. The dielectric constant of SBNS ceramics decrease and the Curie temperature shifts to lower temperature with increasing tin dioxide content. A typical relaxation behavior is observed, and all samples exhibit broad diffuse phase transition.
Key words: strontium barium niobate ceramics; dielectric properties; diffuse phase transition; microstructure
