We report the observation of superparamgnetic behavior induced by the substitution La³⁺ by Ba²⁺ at A-sites and Fe⁺³ by Ti⁴⁺ at B-sites. Ba_0.198La_0.784Ti_0.096Fe_0.8O₃-_δ was synthesized via solid 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 LaFeO₃ and BaTiO₃. The hysteresis loops at 300 K and 10 K show superparamagnetic behavior, which deviate extremely from the antiferromagnetic nature of LaFeO₃ perovskite. The temperature dependent magnetization demonstrates that the material kept a net magnetization of 12.29 (emu/g) at very low temperature.

我们报告观察到由A 2位的Ba ²⁺取代La ³⁺和B 4位的Ti ⁴⁺取代Fe ⁺³引起的超准行为。通过固相反应合成Ba _0.198 La _0.784 Ti _0.096 Fe _0.8 O ₃ - _δ。Rietveld的精炼显示出斜方晶（Pbnm）。低磁STEM结果表明，发现这些颗粒表现出正方形形状，并形成具有高结晶度的单晶。粒径范围为50-300 nm。元素映射表明，Ba和La之间存在互补分布，而Fe和O分布均匀。通过UV-vis分析确定的光学带隙等于1.93 eV，小于报道的LaFeO ₃和BaTiO _3的带隙。300 K和10 K处的磁滞回线表现出超顺磁行为，这与LaFeO ₃钙钛矿的反铁磁性质极为不同。与温度相关的磁化强度表明该材料在非常低的温度下保持12.29（emu / g）的净磁化强度。