Some studies of Cr³⁺ions and Mn⁴⁺ions in magnesium oxide

The fate of structure-bound Mn2+during the decomposition of dolomite and in the resulting conversion products: An EPR study

“…The formation of Mn 4+ impurities in alkaline-earth metal oxides can be ruled out since the EPR parameters are significantly different from those found in the spectra of the annealed samples (cf. Henderson and Hall 1967). Therefore, it is likely that the loss of Mn 2+ signal is due to the formation of MnO 2 .…”

Structures and properties of Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanoparticles synthesized by sol–gel auto combustion technique

“…Depending on the thermal history of the crystal, higher valence states are possible by virtue of which charge compensation can be achieved by Mg vacancies. 21 Among the different methods, the sol–gel method is the most effective method to prepare the nanopowders of metal oxides as it is fast, economic and low temperature is required by this method to synthesize the nanosized samples.…”

Optical and structural properties of Mn doped MgO powders synthesized by Sol-gel process

“…Manganese (Mn) enters the MgO crystal preferentially in the divalent charge state occupying cubic Mg sites. However, depending on the thermal history of the crystal, higher valence states are possible, where charge compensation is achieved by Mg vacancies [14]. In this work, manganese (Mn 2+ ) doped magnesium oxide powders were synthesized by Sol-gel process.…”