A facile sol–gel approach was utilized to synthesis BiFe_1-xTi_xO₃ multiferroic ferrites, denoted as BFO-xTi (with x from 0.00 to 0.10). XRD analysis revealed that the undoped BFO ferrite exhibited a rhombohedral structure, and a transition from the rhombohedral phase to the pseudo-cubic phase occurred as the Ti content increased. The optical band gap increased from 2.00 eV to 2.23 eV with a Ti substitution at 0.10 mol. The magnetic properties exhibited a transition from antiferromagnetic to ferromagnetic phase due to the structural phase transition and super-exchange interaction between the 3d orbitals of Ti⁴⁺ and Fe³⁺/Fe²⁺ at the B-sites through oxygen vacacies. The sample with a 0.10 mol Ti substitution demonstrated the highest M _s and M _r values of 3.68 emu g⁻¹ and 7.21 × 10^–3 emu g⁻¹, respectively. Overall, the results suggest that the BiFe_1-xTi_xO₃ multiferroic ferrites with optimal composition hold promise for use in magneto-optical devices.

中文翻译：

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增强铁氧体钛铋 (BiFe1–xTixO3) 多铁化合物在环境温度下的光学和磁性特性

采用简便的溶胶-凝胶方法合成 BiFe _1-x Ti _x O ₃多铁氧体，表示为 BFO-X钛（与X从 0.00 到 0.10）。 XRD分析表明，未掺杂的BFO铁氧体呈现菱形结构，并且随着Ti含量的增加，发生从菱形相到准立方相的转变。当 Ti 取代量为 0.10 mol 时，光学带隙从 2.00 eV 增加到 2.23 eV。由于Ti ⁴⁺和Fe ³⁺ /Fe ²⁺的3d轨道之间通过氧空位的结构相变和超交换相互作用，磁性表现出从反铁磁相到铁磁相的转变。具有 0.10 mol Ti 取代的样品表现出最高的中号 _沙​中号 _r值分别为 3.68 emu g ⁻¹和 7.21 × 10 ^–3 emu g ⁻¹。总体而言，结果表明具有最佳成分的BiFe _1-x Ti _x O ₃多铁氧体有望用于磁光器件。