A series of Cd0.5Cu0.5-xMgxFe1.95La0.05O4 (x = 0.0, 0.125, 0.25, 0.375, 0.5) nano ferrites was synthesized via sol-gel auto combustion route. XRD analysis confirmed the development of spinel ferrites. Different structural parameters like lattice constant, tetrahedral and octahedral radii, oxygen ion parameter, tolerance factor, bond lengths, edge lengths and interionic distances were calculated from XRD data. It was observed that by increasing the Mg2+ concentration, lattice constant and crystallite size were increased. Energy band gap was measured using UV–vis spectroscopy and found in the range 1.79–2.36 eV. Dielectric properties of the prepared samples were also studied and it was found that dielectric constant and ac conductivity were decreased with increase in Mg²⁺ content. The study indicates that Cd_0.5Cu_0.5-xMg_xFe_1.95La_0.05O₄ nano ferrites have great potential to be utilized in high frequency devices as microwave absorbing material and in optoelectronic devices.

通过溶胶-凝胶自燃路线合成了一系列Cd0.5Cu0.5-xMgxFe1.95La0.05O4（x = 0.0，0.125，0.25，0.375，0.5）纳米铁氧体。XRD分析证实了尖晶石铁素体的发展。从XRD数据计算出不同的结构参数，如晶格常数，四面体和八面体半径，氧离子参数，耐受因子，键长，边长和离子间距离。观察到通过增加Mg 2+浓度，晶格常数和微晶尺寸增加。使用紫外可见光谱法测量能带隙，发现其在1.79–2.36 eV范围内。还研究了所制备样品的介电性能，发现随着Mg ²⁺含量的增加，介电常数和交流电导率降低。研究表明，镉_0.5 Cu _0.5-x Mg _x Fe _1.95 La _0.05 O ₄纳米铁氧体具有巨大的潜力，可用于高频器件中作为微波吸收材料和光电子器件中。