Formation of Fe and Ni substituted LiMn2–XMXO4 nanopowders and their crystal and electronic structure and magnetic properties

The Pechini sol-gel method was applied to obtain LiMn (T = Ni, Fe; x = 0.1 to 0.5) nanopowders. Crystal and electronic structures, chemical composition and magnetic properties of the materials were characterized by X-ray diffraction, XPS, SEM/EDX microscopy, prompt gamma-ray activation analysis (PGA...

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Bibliographic Details
Published in:Materials science--Poland 2017-03, Vol.35 (1), p.159-172
Main Authors: Talik, E., Lipińska, L., Guzik, A., Zajdel, P., Michalska, M., Szubka, M., Kądziołka-Gaweł, M., Paul, R.L.
Format: Article
Language:English
Subjects:
lithium manganese nickel oxides
nanomaterials
spinel
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Summary:The Pechini sol-gel method was applied to obtain LiMn (T = Ni, Fe; x = 0.1 to 0.5) nanopowders. Crystal and electronic structures, chemical composition and magnetic properties of the materials were characterized by X-ray diffraction, XPS, SEM/EDX microscopy, prompt gamma-ray activation analysis (PGAA), Mössbauer spectroscopy and magnetic susceptibility, respectively. XRD measurements showed that the LiMn Ni were single phase for x = 0.1 and 0.2. Three samples with higher Ni content contained some addition of a second phase. Analysis of the oxidation state of the dopants by XPS revealed ionic Ni and Fe . Mössbauer spectroscopy also confirmed 3+ oxidation state of iron and its location in octahedral sites, which excluded the inverse spinel configuration. XPS examinations showed that Mn ions dominated in the iron substituted series whereas the Mn was dominant in the nickel series.
ISSN:2083-134X
DOI:10.1515/msp-2017-0014