Synthesis and study of structural, thermal, optical and magnetic properties of stabilized Mn1−x Ni x O system (0·01 <x < 0·30)

P.P. Bakare,C. E. Deshpande,V.G. Gunjikar,P. Singh,A.B. Mandale,S. K. Date

Synthesis and study of structural, thermal, optical and magnetic properties of stabilized Mn1−x Ni x O system (0·01 <x < 0·30)

1994

A novel chemical passivation route is established to obtain microcrystalline solid solutions of binary oxide system Mn1−x Ni x O (0·01 manganous oxalate is carried out to obtain pure MnO and its subsequent reaction with NiO in oxygen-free nitrogen resulted in microcrystalline powder of these solid solutions. The powder is thoroughly characterized by various physicochemical techniques such as XRD, DTA/TG/DTG, diffused reflectance spectra, magnetic susceptibility, TEM, XPS etc. The observed processing-structure-property correlations confirmed the improved thermal stability of these powders (relative to pure MnO) in air. The important role of dopant paramagnetic Ni2+ ions in enhancing the passivation of the bulk Mn2+ species is explained on the basis of the formation of mixed oxide complex species on the surface of these microcrystalline powders.

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