Thermogravimetric study of the non-stoichiometric w\"ustite FeOx. Pseudo phases w i and w' i . New T-P-X equilibrium phase diagram
Abstract
A statistical numerical analysis of thermogravimetric measurements (temperature, mass variation, oxygen pressure) leads to a new equilibrium phase diagram T-P-X of the iron monoxide or w\"ustite FeOx. Three varieties or pseudo phases W1, W2, W3 are revealed above 911 C, three others W'1, W'2, W'3 below. This diagram displays their subfields, and shows 25 invariant points between stable phases and 8 possible invariant points between metastable phases. A thermodynamic approach is pointed out, which makes possible to characterize the point defects and their clusters as components of the crystal lattice.
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