(1-x)Sr_(1.85)Ca_(0.15)NaNb_5O_(15)-xBiFeO_3陶瓷的显微结构及烧结、介电性能  

Microstructure,Sintering and Dielectric Properties of (1-x)Sr_(1.85)Ca_(0.15)NaNb_5O_(15)-xBiFeO_3 Ceramics

作　　者：马娜[1] 郑兴华[1] 汤德平[1] 

机构地区：[1]福州大学材料科学与工程学院,福州350108

出　　处：《机械工程材料》2012年第1期68-71,80,共5页Materials For Mechanical Engineering

基　　金：福建省科技重大专项及发改委资助项目(2005HZ02-03);福建省高等学校新世纪优秀人才支持计划资助项目(XSJRC2007-16)

摘　　要：采用固相反应法制备了钨青铜结构的(1-x)Sr1.85Ca0.15NaNb5O15-xBiFeO3(SCNN-BFO)陶瓷,研究了BFO含量对该陶瓷显微结构、烧结和介电性能的影响。结果表明:当x≥0.1时,使陶瓷具有最大密度的烧结温度从1 350℃降低到了1 250℃,并且抑制了烧结开裂问题;当x=0.2时,陶瓷中出现了Sr2(FeNb)O6和Bi1.34Fe0.66Nb1.34O6.35杂质相,且二者的含量随BFO含量的增加而增加;x=0.6时,Bi1.34Fe0.66Nb1.34O6.35成为主晶相;x<0.1时,陶瓷的介电常数和介电损耗均较低;随BFO含量的增加,低频介电常数显著增大,介电损耗出现峰值后减小。（1-x）Sr1.85Ca0.15NaNb5O15-xBiFeO3（SCNN-BFO） ceramics with tungsten brone structure were prepared by solid phase reaction method.The effects of BFO contents on microstructure,sintering and dielectric properties of the ceramics were studied.The results show that sintering temperature to make the ceramics owning maximum densy decreased from 1 350 ℃ to 1 250 ℃ when was more than or equal to 0.1,and sintering cracking was restrained.Sr2（FeNb）O6 and Bi1.34Fe0.66Nb1.34O6.35 phases appeared when x=0.2,the both content increased with BFO contents,and Bi1.34Fe0.66Nb1.34O6.35 became the major phase when x=0.6.Dielectric constant and dielectric loss were low when x0.1,low frequency dielectric constant increased rapidly with the increase of BFO content,and the dielectric loss appeared peak value and then decreased.

关 键 词：钨青铜结构 铌酸锶钙钠 铁酸铋 烧结性能 介电性能 

分 类 号：TH117.3[机械工程—机械设计及理论]