Unusual superparamagnetic behavior in bulk Ba0.198La0.784Ti0.096Fe0.8O3-δ
Unusual superparamagnetic behavior in bulk Ba0.198La0.784Ti0.096Fe0.8O3-δ
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散装异常的超顺磁性行为 Ba0.198La0.784Ti0.096Fe0.8O3-δ
DOI：
10.1016/j.materresbull.2020.111187
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发表时间：
2021
影响因子：
5.4
通讯作者：
Manoun, Bouchaib
中科院分区：
文献类型：
--
作者：
El Bachraoui, Fatima;Tamraoui, Youssef;Louihi, Said;Alami, Jones;Shahbazian-Yassar, Reza;Yuan, Yifei;Amine, Khalil;Manoun, Bouchaib
本文报道了A位Ba ~（2+）取代La ~（3+）和B位Ti ~（4+）取代Fe ~（3+）引起的超顺磁行为。采用固相反应法合成了Ba0.198La0.784Ti0.096Fe0.8O3-δ。Rietveld精炼揭示了正交（Pbnm）。低磁STEM结果表明，颗粒被发现表现出类似方形的形状，并形成具有高结晶度的单晶。粒径范围为50 - 300 nm。元素图谱表明Ba和La呈互补分布，Fe和O呈均匀分布。从UV-vis分析确定的光学带隙等于1.93 eV，这是小于报道的LaFeO 3和BaTiO 3。在300 K和10 K的磁滞回线显示出超顺磁性行为，这与LaFeO 3钙钛矿的反铁磁性质非常偏离。温度依赖的磁化强度表明，该材料在很低的温度下保持12.29（emu/g）的净磁化强度。
We report the observation of superparamgnetic behavior induced by the substitution La3+by Ba2+at A-sites and Fe+3by Ti4+at B-sites. Ba0.198La0.784Ti0.096Fe0.8O3-δwas synthesizedviasolid state reaction. The Rietveld refinements revealed an orthorhombic (Pbnm). The low-mag STEM results showed that the particles were found to exhibit square like shape and formed in single crystal with high degree of crystallinity. The particle size ranges of 50−300 nm. Element mapping demonstrates a complementary distribution between Ba and La, while homogenous distribution is found for Fe and O. The optical band gap determined from UV–vis analysis is equal to 1.93 eV which is smaller than the reported one for LaFeO3and BaTiO3. The hysteresis loops at 300 K and 10 K show superparamagnetic behavior, which deviate extremely from the antiferromagnetic nature of LaFeO3perovskite. The temperature dependent magnetization demonstrates that the material kept a net magnetization of 12.29 (emu/g) at very low temperature.
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