1985/01/01 by Ricardo Aragón, D. J. Buttrey, J. Shepherd +1 · 1 citation
Materials Science · Energy · Chemistry · #Magnetic Properties and Synthesis of Ferrites #Iron oxide chemistry and applications #Clay minerals and soil interactions #Charge ordering #Thermomagnetic convection #Magnetite #Condensed matter physics #Annealing (glass) #Materials science #Oxygen #Transition temperature #Thermodynamics #Chemistry #Physics #Charge (physics) #Superconductivity #Magnetic field
paper · doi:10.1103/physrevb.31.430
openalex publication_date 1985/01/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/26
The dependence of the Verwey transition temperature on the nonstoichiometry of Fe_3(1\mathrm\ensuremath-\mathrm\ensuremathδ)O4 has been characterized by thermomagnetic analysis of the initial permeability in magnetite single crystals subjected to subsolidus controlled oxygen fugacity annealing. Nonstoichiometry depresses the transition temperature, which is a maximum for \ensuremathδ=0. For extreme levels of cation deficiency, a second-order transition occurs at 120 K. An anomaly is reported at 250 K.