La³⁺-substituted manganese ferrites with chemical formula MnLa_xFe_(2−x)O₄ (0 ≤ x ≤ 0.03) were prepared via solid -state reaction method. X-ray diffraction (XRD) analysis with Rietveld refinement method confirmed that all compositions exhibited a single-phase formation of manganese ferrite (MnFe₂O₄, cubic (Fd−3 m)). The lattice parameters were found to decrease with increasing La³⁺ ion substitution from 8.505 Å (x = 0) to 8.485 Å (x = 0.03). The substitution process was found to induce the lattice strain and hinder the crystallite growth in the La³⁺-doped samples. The particle size distribution curve of the La³⁺-substituted samples was shifted to smaller size compared to the original sample. Magnetic properties measurement was carried out to reveal the magnetic parameters such as saturation magnetization (M_s), remanence magnetization (M_r), and field coercivity (H_c). The M_s was determined from the law of approach to saturation (LAS) method. As the results, we found that the M_s values were decreased from 17.56 emu/g (x = 0) to 7.09 emu/g (x = 0.03), while the H_c values were increased from 126.50 Oe (x = 0) to 202.00 Oe (x = 0.03). The microwave absorbing property of all MnLa_xFe_(2−x)O₄ (x = 0.0; 0.01; 0.02 and 0.03) series was measured in X-band frequency range (8–12 GHz). The results showed that the substitution of La³⁺ ion was responsible to the improvement of the microwave absorbing ability with the attenuation of microwave which was increased from 91.57 to 97.61%. Thus, the composition with x = 0.03 (MnLa_0.03Fe_1.97O₄) showed an excellent response and can be considered as microwave absorbing material candidate.

 通过固相反应方法制备了化学式为MnLa _x Fe _{(2- x )} O ₄ (0 ≤  x ≤ 0.03)的La ³⁺取代的锰铁氧体。使用 Rietveld 精修方法的 X 射线衍射 (XRD) 分析证实，所有组合物都显示出锰铁氧体 (MnFe ₂ O ₄，立方 ( Fd - 3 m ))的单相形成。发现晶格参数随着 La ³⁺离子取代度从 8.505 Å ( x  = 0) 增加到 8.485 Å ( x = 0.03）。发现置换过程会引起晶格应变并阻碍 La ³⁺掺杂样品中的微晶生长。与原始样品相比，La ³⁺取代样品的粒度分布曲线移动到更小的尺寸。进行磁特性测量以揭示磁参数，如饱和磁化强度 ( M _s )、剩磁 ( M _r ) 和磁场矫顽力 ( H _c )。的中号_小号从的方法法律来饱和（LAS）方法确定。作为结果，我们发现M _s值从 17.56 emu / g (x  = 0) 到 7.09 emu / g ( x  = 0.03)，而H _c值从 126.50 Oe ( x  = 0)增加到 202.00 Oe ( x  = 0.03)。 在 X 波段频率范围 (8-12 GHz) 中测量了所有 MnLa _x Fe _{(2- x )} O ₄ ( x = 0.0；0.01；0.02 和 0.03) 系列的微波吸收性能。结果表明，La ³⁺离子的取代是提高微波吸收能力的原因，微波的衰减从91.57%增加到97.61%。因此，x  = 0.03 (MnLa _0.03 Fe_1.97 O ₄ ) 表现出极好的响应，可以被认为是微波吸收材料的候选者。