TEMPERATURE-PROGRAMMED CHARACTERIZATION STUDIES OF THERMOCHEMICAL EVENTS OCCURRING IN THE COURSE OF DECOMPOSITION OF MN-II OXYSALTS

The thermal decomposition course of the Mn-II oxysalts Mn(NO3)(2) . 4H(2)O, MnC2O4 . 2H(2)O and MnCO3 has been examined in different gaseous atmospheres by thermogravimetry and differential thermal analysis. The solid-phase decomposition products at some selected temperatures were characterized by various bulk and surface analytical techniques. The results were used to assign the thermochemical events encountered in the decomposition course. A complex reaction interface chemistry is implied. It is concluded that the thermochemical behaviour of Mn-II is largely dependent on the nature of the anionic atmosphere and the volatile component being released.