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Substitution effects on the bulk and surface properties of (Li,Ni)Mn2O4

AutorAlburquenque, D.; Denardin, J.C.; Troncoso, L.; Marco, J.F. ; Gautier, J.L.
Fecha de publicación2018
CitaciónIonics 24: 977- 987 (2018)
ResumenManganese oxides of spinel structure, LiMnO, LiNiMnO (0.25 ≤ x≤ 0.75), and NiMnO, were studied by EDS, XRD, SEM, magnetic (M-H, M-T), and XPS measurements. The samples were synthesized by an ultrasound-assisted sol-gel method. EDS analysis showed good agreement with the formulations of the oxides. XRD and Rietveld refinement of X-ray data indicate that all samples crystallize in the Fd3m space group characteristic of the cubic spinel structure. The a-cell parameter ranges from a = 8.2276 Å (x = 0) to a = 8.3980 Å (x = 1). SEM results showed particle agglomerates ranging in size from 2.3 μm (x = 0) down to 0.8 μm (x = 1). Hysteresis magnetization vs. applied field curves in the 5–300K range was recorded. ZFC-FC measurements indicate the presence of two magnetic paramagnetic-ferrimagnetic transitions. The experimental Curie constant was found to vary from 5 to 7.1 cm K mol for the range of compositions studied (0 ≤ x ≤ 1). XPS studies of these oxides revealed the presence of Ni, Mn, and Mn. The experimental Ni/Mn atomic ratios obtained by XPS were in good agreement with the nominal values. A linear relationship of the average oxidation state of Mn with Ni content was observed. The oxide’s cation distributions as a function of Ni content from x = 0 Li[MnMn]O to x = 1 Ni0.352+Mn0.653+[Ni0.652+Mn1.353+]O4 were proposed.
Identificadoresdoi: 10.1007/s11581-017-2266-8
issn: 1862-0760
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