Temperature-programmed characterization studies of thermochemical events occurring in the course of decomposition of MnII oxysalts

Abstract

The thermal decomposition course of the Mn^II oxysalts Mn(NO₃)₂·4H₂O, MnC₂O₄·2H₂O 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.