Fig. 5

EDS spectra of the prepared samples: a NiO; b Ni0.95Cr0.05O; c Ni0.95Fe0.05O; d Ni0.95Co0.05O; e Ni0.95Cu0.05O; f Ni0.95Zn0.05O.

EDS spectra of the prepared samples: a NiO; b Ni0.95Cr0.05O; c Ni0.95Fe0.05O; d Ni0.95Co0.05O; e Ni0.95Cu0.05O; f Ni0.95Zn0.05O.