The increasing plead for the realization of ultra-fast, miniaturized, compact, and ultra-low power consumption in electronic as well as spintronic devices has propelled the quest for novel multiferroic materials that efficiently enable voltage control of magnetism. The present work reports the phase stability, magnetic and dielectric responses of polycrystalline Bi_1−xLa_xFe_1−yNi_yO₃ (0 ≤ x ≥ 0.2 and 0 ≤ y ≥ 0.2) multiferroic ceramics synthesized through a simplistic sol–gel approach. The maneuver substitutions of La at A⁻ site of BiFeO₃ multiferroic eliminate the secondary phases formed owing to impurities. Rietveld refined XRD analysis reveals the structural transformation of the orthorhombic (Pbnm) phase as La substitution increases. However, an additional lattice distortion is induced as a result of the substitutions of Ni atoms at B⁻ site. A substantial enhancement in magnetic and dielectric responses has been found in the co-doped (Ni and La) sample at both A and B⁻ sites as a result of the size confinement of nano-crystallites, the exchange interaction between Fe³⁺ and Ni²⁺ ions, and corresponding variation in Fe–O–Fe bond angles. The dielectric constant has increased substantially in the low-frequency region with simultaneous substitutions of La and Ni at the sites of Bi and Fe, respectively. A careful observation of temperature-dependent magnetization curves (FC and ZFC) indicates a spin glass response with entangled ferromagnetic components. The experimental findings infer that the co-substitutions of La and Ni at their respective sites in Bi_1−xLa_xFe_1−yNi_yO₃ (0 ≤ x ≥ 0.2 and 0 ≤ y ≥ 0.2) may significantly improve the ferromagnetic and dielectric responses of the studied nanoceramics.

在电子及自旋电子器件中实现超快，小型化，紧凑和超低功耗的要求越来越高，这促使人们寻求能够有效地控制磁场电压的新型多铁性材料。本工作报告了多晶Bi _1-x La _x Fe _1-y Ni _y O ₃（0≤X ≥0.2和0≤ ÿ≥0.2）通过简单的溶胶-凝胶法合成的多铁陶瓷。在A处的La的机动取代^-位点的的BiFeO ₃多铁消除由于杂质而形成第二相。Rietveld改进的XRD分析揭示了正交晶（Pbnm）相随La取代度增加而发生的结构转变。然而，附加的晶格畸变被诱导为Ni原子的在B点的替换的结果，^-位点。在A和B两者在磁性和介电响应的大幅提升了在共掺杂被发现（Ni和La）的样品^-位点的纳米微晶的尺寸限制，铁之间的交换相互作用的结果³⁺和Ni ²⁺离子，以及Fe–O–Fe键角的相应变化。介电常数在低频区域显着增加，同时在Bi和Fe处同时取代了La和Ni。仔细观察与温度相关的磁化曲线（FC和ZFC），可以发现自旋玻璃响应与铁磁成分纠缠在一起。实验结果表明，La和Ni在Bi _1-x La _x Fe _1-y Ni _y O ₃（0≤X ≥0.2和0≤ ÿ ≥0.2）可以显着改善所研究的纳米陶瓷的铁磁和介电响应。