Tailoring the electric and magnetic properties of Ba0.8Sr0.2TiO3 ceramics by unsaturated Fe-doping
Tailoring the electric and magnetic properties of Ba0.8Sr0.2TiO3 ceramics by unsaturated Fe-doping
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不饱和Fe掺杂调整Ba0.8Sr0.2TiO3陶瓷的电学和磁学性能
DOI：
10.1007/s10854-020-03530-4
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发表时间：
2020-05
期刊：
影响因子：
--
通讯作者：
Zhu Jinsong
中科院分区：
文献类型：
--
作者：
Wang Junjun;Lu Xiaomei;Gong Baolian;Shao Ye;Lei Lin;Liu Lin;Yan Shuo;Huang Fengzhen;Zhu Jinsong
采用一种特殊的不饱和掺铁方法对Ba0.8Sr0.2TiO_3铁电陶瓷进行掺杂。通过X射线衍射、拉曼光谱和电学测量，我们发现在掺铁的Ba0.8Sr0.2Ti0.9Fe0.1O3、Ba0.8Sr0.18Ti0.9Fe0.1O3−δ和含Fe的Ba0.8Sr0.18Ti0.92Fe0.1O3−δ中，顺电立方相和铁电四方相并存。同时，由于Fe离子(变价)取代了钛和锶，产生了明显的室温铁磁性和磁介电效应，并且在低温下出现了偶极玻璃和自旋玻璃。随着更多的铁离子进入锶中心，铁电性、铁磁性和磁介电效应略有增加，这与氧空位与锶中心低价铁离子偏心形成的偶极子增多以及非等效铁离子之间的铁磁相互作用增强有关。这项工作表明，非饱和掺铁是一种在传统铁电材料中实现电磁性能和磁电耦合的有效方法。
A special unsaturated Fe-doping method is applied to ferroelectric Ba0.8Sr0.2TiO3 ceramics. With the help of X-ray diffraction, Raman spectra, and electrical measurements, we recognize that paraelectric cubic phase and ferroelectric tetragonal phase coexist in the doped ceramics Ba0.8Sr0.2Ti0.9Fe0.1O3, Ba0.8Sr0.18Ti0.9Fe0.1O3−δ and Ba0.8Sr0.18Ti0.92Fe0.1O3−δ with Fe mainly occupy Ti sites. Meanwhile, obvious room temperature ferromagnetism and magnetodielectric effect present, attributed to the substitution of Fe ions (with variable valence) for both Ti and Sr. In addition, there appears dipole glass and spin glass at low-temperature. As more Fe ions enter into Sr sites, ferroelectricity, ferromagnetism and magnetodielectric effect increase slightly, which is related to the increase of dipoles formed between oxygen vacancies and low-valent Fe ions off-center at Sr sites, as well as the enhancement of ferromagnetic interaction between non-equivalent Fe ions. This work manifests the uncommonly used unsaturated Fe-doping as an effective method for tailoring the electric and magnetic properties and realizing magnetoelectric coupling in traditional ferroelectrics.
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DOI：
10.1088/0022-3727/48/44/445301
发表时间：
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