Effect of strontium substitution on the structure and dielectric properties of unfilled tungsten bronze Ba4-xSrxSmFe0.5Nb9.5O30 ceramics
Effect of strontium substitution on the structure and dielectric properties of unfilled tungsten bronze Ba4-xSrxSmFe0.5Nb9.5O30 ceramics
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锶替代对无填充钨青铜Ba4-xSrxSmFe0.5Nb9.5O30陶瓷结构和介电性能的影响
DOI：
10.1016/j.ceramint.2019.12.177
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发表时间：
2020-05
影响因子：
5.2
通讯作者：
Liang Fang
中科院分区：
文献类型：
--
作者：
Shan Wu;Chaozhong Sun;Xiongfeng Yang;Changzheng Hu;Laijun Liu;Liang Fang
系统研究了Sr 2+取代Ba 2+对Ba 4-xSrxSmFe0.5Nb9.5O30（x = 0，1，2，3和4）陶瓷的相结构、显微结构、介电和电学性能的影响。X射线衍射分析表明，Ba_（4-x）Sr_xSm_（Fe_（0.5）Nb_（9.5）O_（30）（x = 0，1，2，3）陶瓷为四方钨青铜化合物，空间群为P4 bm，而x = 4的样品为正交晶系。这一结果可以通过拉曼光谱分析得到证实。随着Sr 2+含量从0增加到3，所有样品的拉曼谱线半峰全宽逐渐增大，表明晶格畸变程度增加。所有的四钨青铜陶瓷都表现出较宽的介电常数峰，并伴有频率色散，表明所有的样品都是弛豫的。利用复阻抗谱进一步研究了BSSFN陶瓷的电学性能。XPS分析表明，Ba_（4-x）Sr_xSm_（Fe_（0. 5）Nb_（9. 5）O_（30））陶瓷中Fe ~（2+）和Fe ~（3+）共存，且二者的比例随Sr ~（2+）浓度的变化而变化。
The effects of Sr2+substitution for Ba2+on phase structure, microstructure, dielectric and electric properties for Ba4-xSrxSmFe0.5Nb9.5O30(x = 0, 1, 2, 3 and 4) ceramics were systematically researched. X-ray diffraction patterns show that Ba4-xSrxSmFe0.5Nb9.5O30(x = 0, 1, 2 and 3) ceramics are tetragonal tungsten bronze compound with a space group ofP4bm, while the sample for x = 4 is an orthorhombic structure compound. The result can be corroborated by the analysis of Raman spectroscopy. As the Sr2+contents increase from 0 to 3, the full width at half maximum of Raman lines of all samples increase gradually, indicating that the degree of lattice distortion increase. All tetragonal tungsten bronze ceramics exhibited a broad permittivity peaks, accompanied by frequency dispersion, indicating all samples are relaxor. The electrical properties of BSSFN ceramics were further studied by complex impedance spectroscopy. XPS spectrum shows that Fe2+and Fe3+coexist in Ba4-xSrxSmFe0.5Nb9.5O30ceramics, and their proportion varies with the concentration of Sr2+.
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