摘要
工作范围在室温附近的功能材料具有潜在的未来应用价值,相比于其他钙钛矿铁电材料基体如BaTiO_3、Bi_(0.5)Na_(0.5)TiO_3,铌酸钠NaNbO3的室温弛豫特性目前尚未得到应有的关注。为了扩展NaNbO_3体系在室温附近的可能应用,实验通过将Bi^(3+)引入NaNbO_3体系制备了(Na_(1-3x)Bi_x)NbO_3组分陶瓷(x=0~0.15),探索了Bi^(3+)掺杂含量对NaNbO_3陶瓷的相结构、显微结构、介电性能和弛豫特性的影响,结果表明:随着Bi^(3+)的掺杂量增加,使得NaNbO_3的室温相结构发生了正交相Pbcm-正交相P21ma-立方相Pm-3m的过渡,同时Bi^(3+)的固溶极限在x=0.10~0.15之间。Bi^(3+)的挥发造成少量气孔的形成,导致陶瓷的致密性逐渐降低。Bi^(3+)增加使得居里温度大幅度下降,从x=0组分的326℃下降至x=0.10组分的-26℃,弛豫程度增加,弛豫因子从x=0组分的1.12上升至x=0.10组分的1.88,伴随着弥散相变和频率色散的现象产生。
Functional materials that working range is near room temperature have potential application in the future.Compared with other perovskite ferroelectric materials,sodium niobate,NaNbO3 composition,have not been paid much attention at present.In order to expand the potential application of of NaNbO3 system near room temperature,this experiment prepared(Na1-3xBix)NbO3 component ceramics(x=0-0.15)by introducing Bi3+into NaNbO3 system,and explored the influence of Bi3+doping content on the phase structure,microstructure,dielectric properties and relaxation characteristics of NaNbO3 ceramics.The results show that with the increase of Bi3+content,(Na1-3 xBix)NbO3 materials occurred phase transition from Pbcm to P21 ma,and finally presented cubic phase at room temperature,and the solid solution limit of Bi3+is between x=0.10~0.15.The volatilization during sintering process of Bi element leads to the formation of pores,which leads to the gradual reduction of ceramic density.The increase of Bi3+significantly reduced Curie temperature,from 326℃of x=0 to-26℃of x=0.10.Meanwhile,the relaxation factor increased from 1.12 of x=0 to 1.88 of x=0.10,accompanied by the appearing of diffusion phase transition and frequency dispersion phenomena.
作者
邵川
张江毅
SHAO Chuan;ZHANG Jiangyi(Market supervision,management,inspection and testing center of Jingdezhen.,Jingdezhen 333001,China;Jingdezhen Ceramic Institute,Jingdezhen 333001,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2020年第9期43-48,共6页
China Ceramics
关键词
铌酸钠
铁电陶瓷
弛豫性能
Sodium niobate
Ferroelectric ceramic
Relaxor property
