期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 127, 期 3, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-021-04361-8
关键词
Double perovskites; Valence states; Magnetic moment; Superexchange interaction; Rietveld analysis
资金
- UGC, New Delhi, under Maulana Azad fellowship scheme [201415-MANF-2014-15-MUS-HAR-39090]
This study provides a deep insight into the electronic, structural, and magnetic properties of single-phase polycrystalline La2Ni1-xFexMnO6 double perovskites. Fe substitution resulted in a mixed-valence state for Ni and Mn in all samples, along with an increase in disorder of the system. The mixed-valence states and disorder enhanced competing magnetic exchange interactions, leading to a reduction in ferromagnetic phase transition temperatures and saturation magnetic moments of the system.
A deep insight into the electronic, structural, and magnetic properties of single-phase polycrystalline La2Ni1-xFexMnO6 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.
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