INTERACTION OF COBALT AND MANGANESE NITRATES WITH GRAPHITE UNDER HYDROTHERMAL CONDITIONS

Abstract

The hydrothermal reduction of cobalt and manganese nitrates with graphite in the temperature range of 250-3500C has been investigated to obtain nanosized spinel structures. As a result, Co2Mn3O8 and (Co,Mn)(Co,Mn)2O4 spinel phases with average particle sizes of 42 nm and 66 nm have been obtained depending upon reaction conditions (temperature, reaction time and ratio of reagents). The compounds had the following compositions in accordance with the data of energy dispersive analysis (EDA): C-graphite - 86.2%, Co2Mn3O8 - 13.8%, and C-graphite - 93.2%; (Co,Mn)(Co,Mn)2O4 - 4.8%, Mn3O4 - 1.6%, Co3O4 - 0.5%.