Spinel Mn–Co oxides, with Mn/Co ato

Spinel Mn–Co oxides, with Mn/Co atomic ratios of 0.5, 1 and 2,
have been prepared by a modified scheme of method described by
Jinénez Mateos et al. (1989). Briefly, different atomic ratios of Mn
and Co carbonate precursors were mixed and heat treated at
400 C for 3 h in air atmosphere. The prepared samples were labeled
as MnCo-0.5, MnCo-1 and MnCo-2, for Mn/Co atomic ratios
of 0.5, 1 and 2, respectively, for simplicity. All chemicals used were
reagent grade and used without any further purification