(桂林電子科技大學(xué) 信息材料科學(xué)與工程系，桂林 541004)
摘 要: 采用傳統(tǒng)固相燒結(jié)法，以化學(xué)純BaCO3，SrCO3，Nb2O5和SnO2粉末為原料，制備0.7BaO·0.3SrO·ySnO2·(1− y/2)Nb2O5(y=0.01~0.07，縮寫(xiě)為SBNS)陶瓷。利用X射線衍射儀、掃描電子顯微鏡和阻抗分析儀研究摻雜SnO2對(duì)SBNS陶瓷的顯微結(jié)構(gòu)和介電性能的影響。結(jié)果表明：在1 320 ℃燒結(jié)可獲得致密SBNS陶瓷；SnO2摻雜對(duì)SBNS陶瓷相結(jié)構(gòu)無(wú)影響，晶相仍為單一的四方鎢青銅固熔體結(jié)構(gòu)；隨著SnO2摻雜量的增加，SBNS陶瓷的介電常數(shù)減小，居里溫度向低溫區(qū)移動(dòng)；SBNS陶瓷具有彌散相變的特性，是典型的介電弛豫體。
關(guān)鍵字: 鈮酸鍶鋇陶瓷；介電性能；彌散相變；微結(jié)構(gòu)
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
