Co掺杂对CaBi_2Nb_2O_9陶瓷结构和电学性能的影响
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摘要
采用传统固相反应法制备CaBi_2Nb_(2-x)Co_xO_9(CBNCo)陶瓷,研究Co掺杂对其微观结构、介电、压电以及电导性质的影响。结果表明:Co掺杂的CBN陶瓷为正交晶系结构,其中,CaBi_2Nb_(1.95)Co_(0.05)O_9陶瓷有杂相生成。所有CBNCo陶瓷均有较高致密性,烧结效果较好。Co的加入使CBN陶瓷烧结密度明显提高,压电性能得到改善;加入Co改性后,CBN陶瓷介电损耗均明显降低,居里温度略微增加。同时,Co的加入引入了更多缺陷,使导电机理有所改变。
CaBi_2Nb_(2-x)Co_xO_9 ceramics were prepared by a solid-state reaction method.The effect of Co doping on their piezoelectric,dielectric and conductive properties was studied.The results show that the structure of Co doped CBN ceramics is the orthorhombic symmetry and CaBi_2Nb_(1.95)Co_(0.05)O_9 ceramics are found with impurity phase.All of the CBNCo ceramics have compact structures and are in good sinter condition.The density and the piezoelectric activity of CBN ceramics are obviously improved with Co doping contents.Co dopant greatly decreases the dielectric loss values and slightly increases the Curie-temperature of CBN ceramics.Meanwhile,the introduction of Co dopant increases the number of defects and thus changes the conductive mechanism.
CaBi_2Nb_(2-x)Co_xO_9 ceramics were prepared by a solid-state reaction method.The effect of Co doping on their piezoelectric,dielectric and conductive properties was studied.The results show that the structure of Co doped CBN ceramics is the orthorhombic symmetry and CaBi_2Nb_(1.95)Co_(0.05)O_9 ceramics are found with impurity phase.All of the CBNCo ceramics have compact structures and are in good sinter condition.The density and the piezoelectric activity of CBN ceramics are obviously improved with Co doping contents.Co dopant greatly decreases the dielectric loss values and slightly increases the Curie-temperature of CBN ceramics.Meanwhile,the introduction of Co dopant increases the number of defects and thus changes the conductive mechanism.
引文
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[2]PENG Z H,ZENG X X,XIANG Y,et al.Dielectric relaxation behavior of Mn-modified Ca0.9Pr0.05[]0.05Bi2Nb2O9-based high temperature piezoceramics[J].Ceramics International,2017,43:1249-1255.
[3]刘军凯.高居里温度压电材料研究进展[J].压电与声光,2012,34(1):100-105.LIU J K.Current development of piezoelectric materials with high Curie temperature[J].Piezoelectrics and Acoustooptics,2012,34(1):100-105.
[4]ZHANG S,YU F.Piezoelectric materials for high temperature sensor[J].Journal of the American Ceramic Society,2011,94(10):3153-3170.
[5]廖运文,肖定全.无铅压电陶瓷Bi0.5(Na0.90-xKxLi0.10)0.5TiO3-KNbO3的微结构与电学性能[J].材料工程,2008(5):39-42.LIAO Y W XIAO D Q.Microstructure and electrical properties of Bi0.5(Na0.90-xKxLi0.10)0.5TiO3-KNbO3 Lead-free Piezoelectric Ceramics[J].Journal of Materials Engineering,2008(5):39-42.
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[7]YAO Z,LIU H,LIU Y,et al.High-temperature relaxor cobaltdoped(1-x)BiScO3-xPbTiO3piezoelectric ceramics[J].Applied Physics Letters,2008,92(14):142905.
[8]XU Q,CHEN M,CHEN W,et al.Effect of CoO additive on structure and electrical properties of(Na0.5Bi0.5)0.93Ba0.07TiO3ceramics prepared by the citrate method[J].Acta Materialia,2008,56(3):642-650.
[9]HOU J,QU Y,VAISH R,et al.Effect of Sb Substitution on the structural and electrical properties of Bi4Ti3-2xNbxTaxO12ceramics[J].Journal of the American Ceramic Society,2011,94(8):2523-2529.
[10]ZHAO T L,GUO Z L,WANG C M.The Effects of Na/K ratio on the electrical properties of sodium-potassium bismuth titanate Na0.5Bi4.5Ti4O15-K0.5Bi4.5Ti4O15[J].Journal of the American Ceramic Society,2012,95(3):1062-1067.
[11]YAN H,ZHANG H,UBIC R,et al.A lead-free high-curie-point ferroelectric ceramic CaBi2Nb2O9,Advanced Materials[J].2005,17:1261-1265.
[12]WANG C M,WANG J F,ZHANG S,et al.Piezoelectric and electromechanical properties of ultrahigh temperature CaBi2Nb2O9ceramics[J].Physica Status Solidi-rapid Research Letters,2009,3(2/3):49-51.
[13]ZHANG X,YAN H,REECE M J.Effect of A site substitution on the properties of CaBi2Nb2O9,ferroelectric ceramics[J].Journal of the American Ceramic Society,2008,91(9):2928-2932.
[14]TIAN X,QU S B,DU H L,et al.Effects of(LiCe)co-substitution on the structural and electrical properties of CaBi2Nb2O9ceramics[J].Chinese Physics B,2012,21(3):37701-37705(5).
[15]WANG C M.High temperature piezoelectric properties of Crmodified calcium bismuth niobate(CaBi2Nb2O9)[EB/OL].Beijing:China’s Scientific and Technical Papers Online,[2013-02-01].http:∥www.paper.edu.cn/releasepaper/content/201302-211.
[16]贾菲,林声和.压电陶瓷[M].北京:科学出版社,1979.JA F,LIN S H.Piezoelectric ceramics[M].Science Press,1979.
[17]WANG C M,ZHAO L,WANG J F,et al.Enhanced piezoelectric properties of sodium bismuth titanate(Na0.5Bi4.5Ti4O15)ceramics with B-site cobalt modification[J].Physica Status Solidi-rapid Research Letters,2009,3(1):7-9.
[18]DIAO C L,XU J B,ZHENG H W,et al.Dielectric and piezoelectric properties of cerium modified BaBi4Ti4O15ceramics[J].Ceramics International,2013,39(6):6991-6995.
[19]SIMES A Z,RICCARDI C S,CAVALCANTE L S,et al.Impact of oxygen atmosphere on piezoelectric properties of CaBi2Nb2O9thin films[J].Acta Materialia,2007,55(14):4707-4712.
[20]BATRA V,RAMANA C V,KOTRU S.Annealing-induced changes in chemical bonding and surface characteristics of chemical solution deposited Pb0.95La0.05Zr0.54Ti0.46O3thin films[J].Applied Surface Science,2016,379:191-198.
[21]KESWANI B C,DEVAN R S,KAMBALE R C,et al.Correlation between structural,magnetic and ferroelectric properties of Fedoped(Ba-Ca)TiO3lead-free piezoelectric[J].Journal of Alloys and Compounds,2017,712:320-333.
[22]DEVAN R S,LIN C L,GAO S Y,et al.Enhancement of greenlight photoluminescence of Ta2O5nanoblock stacks[J].Physical Chemistry Chemical Physics,2011,13(29):13441-13446.
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