A deep insight into the electronic, structural, and magnetic properties of single-phase polycrystalline La₂Ni_1-xFe_xMnO₆ double perovskites has been presented. X-ray photoelectron spectroscopy revealed that the Fe substitution resulted in a mixed-valence state for Ni and Mn in all samples. Rietveld analysis of the powder X-ray diffraction data suggested that all samples exhibited the orthorhombic structure with the Pbnm space group. Raman spectroscopy measurements indicated an increase in disorder of the system with Fe doping. The mixed-valence states and the accompanied disorder enhanced the competing magnetic exchange interactions in the samples resulting in a reduction of the ferromagnetic phase transition temperatures and saturation magnetic moments of the system.

提出了对单相多晶La ₂ Ni _{1- x} Fe _x MnO ₆双钙钛矿多晶的电子，结构和磁性的深刻见解。X射线光电子能谱显示，所有样品中的Fe取代导致Ni和Mn的混合价态。粉末X射线衍射数据的Rietveld分析表明，所有样品均具有Pbnm的正交结构。空间群。拉曼光谱测量表明，Fe掺杂会增加系统的无序性。混合价态和伴随的无序状态增强了样品中竞争性的磁交换相互作用，从而降低了铁磁相变温度和系统的饱和磁矩。