Abstract In this work we have investigated the magnetic and dielectric properties of xBa2FeNbO6–(1-x)LaFeO3 [x = 0.1, 0.3, 0.5] prepared by the solid state reaction technique. The Rietveld refinement of the X-ray diffraction pattern of the samples is performed to confirm the phase formation as well as the crystal structure of the materials. The x = 0.1 and 0.5 materials have orthorhombic Pbnm and cubic Fm3m crystal symmetry respectively. Whereas x = 0.3 material has both Pbnm (83.64%) and Fm3m (16.36%) phases. The effect of lattice distortion on the magnetic and dielectric properties has been discussed. The temperature dependent magnetization study reveals the anti-ferromagnetic behaviour of the materials. The magnetic field dependence magnetization curve indicates the canting of Fe3+ spins in these materials like LaFeO3. The value of magnetization has increased with respect to pure LaFeO3. The dielectric relaxation of the materials is analyzed within impedance and electric modulus mechanisms. The value of conductivity and dielectric constant increases with the increase of x value. Two semi-circular arcs in the complex impedance plane plot originate due to the grain and grain-boundary contributions which give rise to two dispersion regions in the frequency dependence conductivity spectra of the materials. The complex impedance plane plot is described by an electrical equivalent circuit consisting of two parallel RC elements connected in series.

中文翻译：

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xBa 2 FeNbO 6 –(1-x)LaFeO 3 [x = 0.1, 0.3, 0.5] 的反铁磁行为和介电弛豫

摘要 在这项工作中，我们研究了通过固态反应技术制备的 xBa2FeNbO6–(1-x)LaFeO3 [x = 0.1, 0.3, 0.5] 的磁性和介电性能。对样品的 X 射线衍射图进行 Rietveld 精修，以确认材料的相形成以及晶体结构。x = 0.1 和 0.5 材料分别具有正交 Pbnm 和立方 Fm3m 晶体对称性。而 x = 0.3 的材料同时具有 Pbnm (83.64%) 和 Fm3m (16.36%) 相。已经讨论了晶格畸变对磁性和介电特性的影响。温度相关磁化研究揭示了材料的反铁磁行为。磁场相关磁化曲线表明这些材料（如 LaFeO3）中 Fe3+ 自旋的倾斜。相对于纯 LaFeO3，磁化值有所增加。在阻抗和电模量机制内分析材料的介电弛豫。电导率和介电常数值随着x值的增加而增加。复阻抗平面图中的两个半圆弧源于晶粒和晶界的贡献，这在材料的频率相关电导率谱中产生了两个色散区域。复阻抗平面图由一个等效电路描述，该电路由两个串联的并联 RC 元件组成。电导率和介电常数值随着x值的增加而增加。复阻抗平面图中的两个半圆弧源于晶粒和晶界的贡献，这在材料的频率相关电导率谱中产生了两个色散区域。复阻抗平面图由一个等效电路描述，该电路由两个串联的并联 RC 元件组成。电导率和介电常数值随着x值的增加而增加。复阻抗平面图中的两个半圆弧源于晶粒和晶界的贡献，这在材料的频率相关电导率谱中产生了两个色散区域。复阻抗平面图由一个等效电路描述，该电路由两个串联的并联 RC 元件组成。