Thermal synthesis of NiMn2O4 spinel employing Mn oxide ores as starting material

It is described for the first time synthesis and characterization of NiMn2O4 employing Mn ores from Amazon Region as starting material, instead using commercial reagents normally occurs in its process. Initially, an ore was transformed into a single product, octahedral layer (OL) manganese oxide with Ni2+ ions interlayer (Ni-OL-2), which used matrix to obtain by thermal decomposition. The following techniques were characterization: X-ray diffraction (XRD), fluorescence spectroscopy (XRF), infrared (FTIR), analysis (TG-DTA), scanning (SEM) transmission (TEM) electron microscopies. results revealed that composed nsutite mineral well-ordered crystalline Ni-OL-2 phase, after hydrothermal cation exchange decomposition produced nickel manganite phase at 850 °C spherical ball morphology crystal sizes range 200-300 nm.