Effects of Sr-substitution on structure, dielectric, ferroelectric and magnetic properties of (SrxBa1-x)(4)Sm2Fe2Nb8O30 ceramics
Effects of Sr-substitution on structure, dielectric, ferroelectric and magnetic properties of (SrxBa1-x)(4)Sm2Fe2Nb8O30 ceramics
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Sr取代对(SrxBa1-x)(4)Sm2Fe2Nb8O30陶瓷结构、介电、铁电和磁性能的影响
DOI：
10.1016/j.jallcom.2018.08.109
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发表时间：
2019
影响因子：
6.2
通讯作者：
Wu Yong Jun
中科院分区：
文献类型：
--
作者：
Hong Jiang Sheng;Huang Yu Hui;Liu Xiao Qiang;Li Juan;Wu Yong Jun
采用标准固相法制备了具有四方青铜结构的（SrxBa 1-x）4Sm 2Fe 2Nb 8 O30（x= 0，0.1，0.2，0.3，0.4）陶瓷。随着x的增加，（SrxBa 1-x）4Sm 2Fe 2Nb 8 O30陶瓷由铁电体向顺电体转变。当x = 0时，在室温以上的温度范围内出现一级铁电相变。其他组合物表现出宽的介电峰与频率色散，表明弛豫铁电转变。在室温下，当x = 0和0.1时，在充电电流-电场（J-E）曲线上观察到饱和的P-E磁滞回线和明显的峰值，而在其它两种情况下则观察到顺电特性。磁滞回线和剩磁随Sr含量的增加从0.14 emu/g单调增加到1.21 emu/g。所有的研究结果都有望为寻找新的多铁性钨青铜陶瓷提供有价值的指导。
(SrxBa1-x)4Sm2Fe2Nb8O30(x= 0, 0.1, 0.2, 0.3, 0.4) ceramics with tetragonal bronze structure were prepared by the standard solid-state method. With the increase ofx, (SrxBa1-x)4Sm2Fe2Nb8O30ceramics transform from ferroelectric to paraelectric. The compositionx= 0 shows first-order ferroelectric transition withTcabove room temperature. The other compositions exhibit broad dielectric peaks with frequency dispersion, indicating a relaxor ferroelectric transition. SaturatedP-Ehysteresis loops and obvious peaks in the charging current–field (J-E) curves are observed at room temperature forx= 0 and 0.1 while paraelectric characteristics are detected for the others. Magnetic hysteresis loops are obtained for all the compositions and the remanent moment increases monotonously from 0.14 emu/g to 1.21 emu/g with the increasing concentration of Sr. All the results are expected to provide valuable guidance for searching new multiferroic tungsten bronze ceramics.