Eu~(3+)掺杂钛酸锶钡陶瓷的介电性能实验研究
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摘要
本文设计了氧化铕(Eu_2O_3)掺杂的(Ba_(0.7)Sr_(0.3))TiO_3(后简称BST)电子陶瓷。用XRD和SEM等分析测试手段研究了该陶瓷的相组成、微观结构;用阻抗分析仪测定分析了介电常数和介电损耗。结果表明:在BST陶瓷中掺入微量Eu_2O_3,可以使得BST陶瓷在室温下的介电常数降低,并且随着掺入量的增加下降加快。而介电损耗(tanδ)则先减小后增大,当Eu含量为0.03%时,tanδ最低。通过对该材料进行微观分析发现,Eu掺杂后BST陶瓷仍为钙钛矿结构,无其他杂相生成,但晶粒会发生变化,当掺杂量为0.05%时,晶粒发育最为完整;可见Eu掺杂确实能够改变BST陶瓷的微观结构及介电性能。
In this paper special formulas were designed for Eu_2O_3-doped(Ba_(0.7)Sr_(0.3)) TiO_3 electronic ceramics. Then samples were prepared by solid-state reaction sintering method. XRD and SEM were used to analyze their phase composition and microstructure. The piezoelectric impedance analyzer was used to analyze their dielectric constant and dielectric loss. The results showed that when Eu_2O_3 was doped, the dielectric constant of the ceramics was reduced at room temperature. However, the dielectric loss(tanδ) decreased first and then increased.When the Eu content was 0.03%, the tanδ was the lowest. The microstructure analysis found that with Eu doping, the BST ceramics were still composed of the perovskite phase and tungsten bronze phase, but the grains of the samples changed. When the doping was 0.05%, their crystal development was the best. Therefore, Eu doping could obviously change the ceramic microstructure and dielectric properties.
In this paper special formulas were designed for Eu_2O_3-doped(Ba_(0.7)Sr_(0.3)) TiO_3 electronic ceramics. Then samples were prepared by solid-state reaction sintering method. XRD and SEM were used to analyze their phase composition and microstructure. The piezoelectric impedance analyzer was used to analyze their dielectric constant and dielectric loss. The results showed that when Eu_2O_3 was doped, the dielectric constant of the ceramics was reduced at room temperature. However, the dielectric loss(tanδ) decreased first and then increased.When the Eu content was 0.03%, the tanδ was the lowest. The microstructure analysis found that with Eu doping, the BST ceramics were still composed of the perovskite phase and tungsten bronze phase, but the grains of the samples changed. When the doping was 0.05%, their crystal development was the best. Therefore, Eu doping could obviously change the ceramic microstructure and dielectric properties.
引文
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[2]DURAN C,SUSAN M T,MESSING L G.Fabrication and electrical properties of textured Sr0.53Ba0.47Nb2O6 ceramics by templated grain growth[J].Am Ceram Soc,2000,83:2203-2212.
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[5]李俊,刘鹏,周静,等.钕掺杂对(Ba0.6Sr0.4TiO3)/MgO陶瓷结构和性能的影响[J].中国稀土学报,2009,27(2):223-227.LI J,LIU P,ZHOU J,et al.Journal of the Chinese Earth Society,2009,27(2):223-227.
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[7]李波,沈雷军,王忠志,等.Sm2O3掺杂BSTN陶瓷的制备与介电性能[J].稀土,2012,33(1):19-23.LI B,SHEN L J,WANG Z Z,et al.Chinese Rare Earths,2012,33(1):19-23.
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[9]陈晓辉,李建革,张海岩.稀土在电磁屏蔽材料中的应用研究进展[J].稀土,2015,36(3):116-121.CHEN X H,LI J G,ZHANG H Y.Chinese Rare Earths,2015,36(3):116-121.
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