钠掺杂对Bi_(1.5)ZnNb_(1.5)O_7陶瓷结构和介电弛豫的影响
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摘要
采用二次固相反应法制备Bi_(1.5-x)Na_xZnNb_(1.5)O_7(BNZN,0 The Bi_(1.5-x)Na_xZnNb_(1.5)O_7(BNZN,0 < x≤0. 4) ceramics were manufactured by secondary solid phase reaction method. The sintering characteristics, phase structure and dielectric properties of substituting Na+for Bi3 +about Bi_(1.5)ZnNb_(1.5)O_7 based ceramics were investigated. The results show that Bi_(1.5-x)Na_xZnNb_(1.5)O_7 ceramics exhibite a single pyrochlore phase when Na+substitution x≤0. 3; When x =0. 4,The disappearance of partial diffraction peaks may be caused by changes in the shape of the Polyhedron,The dielectric constant decrease and dielectric loss increase gradually with the change of Na+additives at 1 MHz. The dielectric relaxation behavior is obviously observed for BNZN ceramics at-195 ～150 ℃,The peak shape of the low temperature dielectric relaxation gradually sharpens,The peak temperature of Na-doped samples are-100. 9 ℃,-109. 3 ℃,-116. 2 ℃,-117. 5 ℃,respectively.
引文
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[2]金彪,徐卓越,汪潇,等,不同方式引入CuO制备低温烧结(Bi1. 5Zn0. 5)(Zn0. 5Nb1. 5)O7陶瓷[J].粉末冶金技术,2018,36(5):386-392.
[3] Cheng H,Du H,Zhou W,et al. Microstructure and dielectric properties of(K0. 5Na0. 5)Nb O3-Bi(Zn2/3Nb1/3)O3-xmol%CeO2lead free ceramics for high temperature capcitor application[J]. Journal of materials science:Materials in Electronics,2015,26(11):9097-9106.
[4]李在映,丁士华,宋天秀,等. Na掺杂Bi2O3-Zn O-Nb2O5基陶瓷的性能[J].电子元件与材料,2010,29(10):7-10.
[5]龚雨庭,钟朝位. Li2O-B2O3-Si O2玻璃相掺杂对BZN陶瓷介电性能影响[J].电子元件与材料,2015,34(10):6-9.
[6]徐琴,丁士华,宋天秀,等. Nd2O3掺杂对BCZT陶瓷结构与介电性能的影响[J].硅酸盐学报,2013,41(3):292-297.
[7] Nguyen Binh,Liu Yun,Withers Ray L. The local crystal chemistry and dielectric properties of the cubic pyrochlore phase in the Bi2O3-M2+ONb2O5(M2+=Ni2+and Mg2+)sytems[J]. Joural of solid state chemistry. 2007,180(2):549-557.
[8]胡明哲,周东祥,龚树萍.微波介质陶瓷介电性能影响因素的研究[J].材料导报,2004,8(18):7-10.
[9] Shannon R D. Dielectric polarizabilities of ions in oxides and fluorides[J]. J. Appl. Phys. 1993,73(1):348-366.
[10] Huang S M,Feng C D,Chen L D,et al. Dielectric properties of Sr Bi2-xPrxNb2O9ceramics(x=0,0. 04 and 0. 2)[J]. Solid State Communications,2005,133:375-379.
[11]殷之文.电介质物理学[M].北京:科学出版社. 2017,47-48.