富钛型钛酸锶钡基陶瓷的微观结构与介电性能
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摘要
采用传统固相法制备Nd_2O_3掺杂富钛型(Ba0.75Sr0.25)Ti1+xO3(x为摩尔比)陶瓷,通过扫描电镜及LCR测试系统,研究不同x值、Nd_2O_3掺杂量及烧结工艺对钛酸锶钡基陶瓷微观结构与介电性能的影响。结果表明,随着x值及Nd_2O_3掺杂量增大,陶瓷试样均出现柱状第二相。当x=0.01且w(Nd_2O_3)=0.4%时,陶瓷试样经1 250℃烧结2h后,其室温相对介电常数(εr)高达8.67×103,介电损耗(tanδ)仅为7.87×10-3。随着x值及Nd_2O_3掺杂量增大,陶瓷的居里峰显著移动。
The Nd_2O_3 doped Ti-rich(Ba0.75 Sr0.25)Ti1+xO3 ceramics were prepared by the conventional solid statemethod.The effects of different xvalues,Nd_2O_3 doping content and sintering procession on the microstructures and dielectric properties of barium strontium titanate based ceramics were investigated by using SEM and LCR measure system.It is found that with the increase of xvalue and Nd_2O_3 doping content,the cylindrical grains namely the secondary phases exist in ceramic samples.When x=0.01 and w(Nd_2O_3)=0.4%,the sample sintered at 1 250℃for2 hexhibits high relative dielectric constant(εr)of up to 8.67×103 and low dielectric loss(tanδ)of merely 7.87×10-3.With the increase of xvalue and Nd_2O_3 doping content,the Curie peak of the ceramics system shifts obviously.
The Nd_2O_3 doped Ti-rich(Ba0.75 Sr0.25)Ti1+xO3 ceramics were prepared by the conventional solid statemethod.The effects of different xvalues,Nd_2O_3 doping content and sintering procession on the microstructures and dielectric properties of barium strontium titanate based ceramics were investigated by using SEM and LCR measure system.It is found that with the increase of xvalue and Nd_2O_3 doping content,the cylindrical grains namely the secondary phases exist in ceramic samples.When x=0.01 and w(Nd_2O_3)=0.4%,the sample sintered at 1 250℃for2 hexhibits high relative dielectric constant(εr)of up to 8.67×103 and low dielectric loss(tanδ)of merely 7.87×10-3.With the increase of xvalue and Nd_2O_3 doping content,the Curie peak of the ceramics system shifts obviously.
引文
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[6]曲远方,李远亮,刘超,等.掺杂Y2O3对BaSrTiO3介质瓷性能的影响[J].电子元件与材料,2010,29(10):11-13.QU Yuanfang,LI Yuanliang,LIU Chao,et al.Effect of doped Y2O3on properties of BaSrTiO3ceramic[J].Electronic Components and Materials,2010,29(10):11-13.
[7] ZHANG Jingji,ZHAI Jiwei,CHOU Xiujian,et al.Influence of rare-earth addition on microstructure and dielectric behavior of Ba0.6Sr0.4TiO3ceramics[J].Materials Chemistry and Physics,2008,111:409-413.
[8] LI Yuanliang,QU Yuanfang.Dielectric properties and substitution mechanism of samarium-doped BST ceramics[J].Materials Research Bulletin,2009,44(1):82-85.
[9]杨文,常爱民,杨邦朝.晶粒尺寸对Ba0.8Sr0.2TiO3陶瓷介电铁电特性的影响[J].硅酸盐学报,2002,30(3):390-397.YANG Wen,CHANG Aimin, YANG Bangchao.Effect of grain size on dielectric and ferroelectric properties of Ba0.8Sr0.2TiO3ceramics[J].Journal of the Chinese Ceramic Society,2002,30(3):390-397.
[10]SZYMCZAK L,UJMA Z,HAFIDEREKJ,et al.intering effects on dielectric properties of(Ba,Sr)TiO3ceramics[J].Ceramics International,2004,30(6):1003-1008.
[11]DONG H,JIN D,XIE C,et al.Compositionally inhomogeneous Ti-excess barium strontium titanate ceramics with a robust dielectric temperature stability[J].Materials Letters,2014,135:83-86.
[12]张晨,白雪,杜艺兰,等.Sb2O3对富钛型钛酸锶钡基陶瓷结构及性能的影响[J].压电与声光,2015,37(6):983-986.ZHANG Chen,BAI Xue,DU Yilan,et al.Effect of Sb2O3on the structure and properties of Rich-Ti barium titanate based ceramics[J].Piezoelectrics&Acoustooptic,2015,37(6):983-986.