摘要
采用研磨-退火工艺将La^(3+)、Mg^(2+)分别掺杂入钛酸钡中,制备掺杂比例为2%、3%、4%(摩尔分数)的3组样品,将其放置在海水与富盐空气环境下0、24、48、72 h,通过阻抗分析仪、XRD、SEM、EDS表征手段与相同处理方式的纯钛酸钡陶瓷进行对比分析,探究海水与富盐空气对掺杂钛酸钡陶瓷的介电性能影响。结果表明,在海水72 h内,掺杂La^(3+)的钛酸钡低频(10^(2)~10^(3)Hz)相对介电常数增量比纯钛酸钡的少,而Mg^(2+)掺钛酸钡低频相对介电常数增量比纯钛酸钡的多。通过SEM可以明显看到La^(3+)掺杂摩尔比4%时腐蚀程度最轻,这得益于其较高的烧结密度,Mg^(2+)掺杂钛酸钡陶瓷孔隙增加,腐蚀加剧。另外,无论是La^(3+)还是Mg^(2+)掺杂,在富盐空气72 h内下其介电损耗都没有得到保护,这是因为La及Mg的引入使钛酸钡在潮湿环境下产生明显的孔隙,盐分在内部结晶,内部空气富含盐分容易被电离,导致介电损耗增加。通过XRD对处理后的样品进行分析,并没有明显的峰值偏移,也没有杂峰出现。通过EDS可以明显看到有其它成分存在样品表面。
La^(3+)and Mg^(2+)were doped into barium titanate by grinding and annealing process,and three groups of samples with doping ratio of 2%,3%and 4%(molar fraction)were prepared.The samples were placed in seawater and salt-rich air environment for 0,24,48 and 72 hours.By means of impedance analyzer,XRD,SEM and EDS,the effects of seawater and salt-rich air on dielectric properties of doped barium titanate ceramics were studied.The results show that the increment of permittivity of barium titanate doped with La^(3+)at low frequency(10^(2)-10^(3)Hz)is lower than that of pure barium titanate,while the increment of permittivity of Mg^(2+)at low frequency is higher than that of pure barium titanate during 72 h in seawater.Through SEM,it can be clearly seen that the corrosion degree is lightest when the molar ratio of La^(3+)is 4%,which is due to its high sintering density,and the porosity of Mg^(2+)doped barium titanate ceramics increases and the corrosion intensifies.In addition,no matter La^(3+)or Mg^(2+)doping,the dielectric loss is not protected in the salt-rich air for 72 h,because the introduction of La and Mg makes barium titanate produce obvious pores in the humid environment,and the salt crystallizes in the internal air,which is rich in salt and easily ionized,resulting in an increase in dielectric loss.By XRD analysis of the treated samples,there is no obvious peak shift and no miscellaneous peaks.The presence of other components on the sample surface can be clearly seen by EDS.
作者
梁博
黄祺薇
谢雨芹
朱明璋
邴丽娜
沈振江
LIANG Bo;HUANG Qiwei;XIE Yuqin;ZHU Mingzhang;BING Lina;SHEN Zhenjiang(College of Physics and Electronic Engineering,Hainan Normal University,Haikou 571158,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第12期12224-12236,共13页
Journal of Functional Materials
基金
国家自然科学基金项目(11304069)
海南省自然科学基金项目(220RC595)
海南省自然科学基金项目(521QN240)
海南省激光技术与光电功能材料重点实验室经费
海南省院士创新平台科研项目(YSPTZX202207)。
关键词
掺杂
钛酸钡
介电性能
腐蚀
doping
barium titanate
dielectric properties
corrosion
作者简介
通讯作者:邴丽娜,E-mail:binglina121@126.com;通讯作者:沈振江,E-mail:zjshenmail@163.com;梁博(1998-),男,硕士在读,师承沈振江教授,从事无机功能材料研究。
