The synthesis, crystal growth, and characterization of nonstoichiometric magnetite
A review is provided concerning the thermodynamic and electrical characteristics of nonstoichiometric magnetite, Fe3(1-δ)O4. Great stress is placed on the need for careful preparation and appropriate annealing of single crystal specimens. Information needed to prepare material of a given δ value is provided. For δ≤0·0039 magnetite undergoes a first-order phase change at the Verwey transition; for δ>0·0039 the change is of second or higher order. Corresponding types of changes are encountered in resistivity and Seebeck coefficient measurements. Some aspects of the Verwey transition are discussed.
Volume 134, 2022
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