Thermogravimetric study of the non-stoichiometric w\"ustite FeOx. Pseudo phases w i and w' i . New T-P-X equilibrium phase diagram

TL;DR

This paper presents a new thermodynamic phase diagram for non-stoichiometric wüstite FeOx, revealing multiple pseudo phases and invariant points through thermogravimetric analysis and statistical modeling.

Contribution

It introduces a novel T-P-X phase diagram for FeOx, identifying multiple pseudo phases and invariant points, and offers a thermodynamic approach to characterize defect structures.

Findings

Identification of six pseudo phases of FeOx

Discovery of 25 invariant points in the phase diagram

Thermodynamic characterization of defect clusters

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 {\textdegree}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.