Defect structure and transport properties of non-stoichiometric ferrous oxide

Self-propagating high-temperature synthesis of nonstoichiometric wüstite

“…The simplest cluster is the so-called 4:1 cluster, which consists of 4 cation vacancies, 1 cation interstitial, and a variable number of holes. The 16:5 cluster formed by the aggregation of 4:1 clusters is an element of the inverse spinel structure typical of Fe 3 O 4 [7]. Therefore, a product with large nonstoichiometric value tends to have a high Fe 3 O 4 content.…”

“…Intensive investigations of the thermodynamic and structural properties as well as the electrical properties of the Fe x O system have been executed. These studies suggest that defect ordering within the Fe x O phase may be complex [7]. The unusual electronic properties of Fe x O including the fact that it is a semiconductor whose carrier type changes from p to n type around x = 0.92 [8] make Fe x O interesting in its own right.…”

Mechanism and kinetics of the reduction of magnetite to iron during heating in a microwave E-field maximum

“…The change in the slope of the lattice parameter of secondary wüstite may signal an order-disorder transition between wüstite subphases, i.e., the crossing over a boundary line in the Fe-O phase diagram. 19,20 The lattice expansion is mainly due to the evolution of W2 toward stoichiometry. The linear correlation established in Ref.…”

Advanced Mineralogy

“…The defect chemistry of wiistite is very complex and has been covered by several reviews (Hazen and leanloz 1984;Gleitzer and Goodenough 1985;Mrowec and Podg6recka 1987). Wiistite is important both for materials science (it is a major component of the oxide scale that forms on iron alloys) and earth science (magnesiowiistite is thought to be an important lower-mantle phase).…”