Complex Metal Oxide Oxidation State Changes Monitoring by TGA and Dilatometric Means

Abstract

Oxidation processes during metal oxide heat treatment are important events that can be monitored by the means of well-known TGA/DTA and dimensional change diagrams. Powders Mn0.63Zn0.37Fe2O4 oxide was milled in different time duration and thermal analysis techniques afterwards during heating were observed. Cation that serves this purpose well for is Mn ion that passes through Mn2+ to Mn3+ state at 360 °C by oxidation and after that from Mn4+ to Mn3+ reduction process at 580 °C. Minimal data treatment of first derivative on shrinkage for obtaining shrinkage rate diagrams and as well first derivative on thermal gravimetric diagram for obtaining differential thermal gravimetric analysis diagram enable the oxidation and reduction processes monitoring.