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Iron Oxides: Properties and Transitions in Class 11 Materials

Explore the characteristics, transitions, and magnetic properties of Fe3O4 and other iron oxides in Class 11 materials. Discover key insights from renowned studies and seminal papers in this field.

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Iron Oxides: Properties and Transitions in Class 11 Materials

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  1. Class 11, Fe3O4 and other iron oxides Fe3O4: The canonical magnetic material (lodestone). 858 K ordering temperature because of double exchange. From Wikimedia Commons, the free media repository Néel, Nobel Lecture (1970).

  2. Class 11, Fe3O4 and other iron oxides MgAl2O4 Ubiquitous structure when ions have similar sizes, around 0.6 Å. A is tetrahedrally coordinated, and B octahedral (actually with a slight trigonal distortion). In general, lower oxidation states and smaller bandwidths than in perovskites.

  3. Class 11, Fe3O4 and other iron oxides Fe3O4: The canonical Néelferrimagnet. Schull, Woollan, Strauser, Phys. Rev. Let. (1950) 483–484.

  4. Class 11, Fe3O4 and other iron oxides Fe3O4: The Verwey transition. Sample I has FeO:Fe2O3 = 1:1.025 and sample II has FeO:Fe2O3 = 1:1.08. Note the resistivity upturn near the room temperature. Verwey, Nature (August 1939) 327–328.

  5. Class 11, Fe3O4 and other iron oxides There is a very great sensitivity on stoichiometry Honig, J. Alloys. Compounds229 (1995) 24–39.

  6. Class 11, Fe3O4 and other iron oxides The Verwey transition is not simple. Anderson, Phys. Rev. 102 (1956) 1008–1013.

  7. Class 11, Fe3O4 and other iron oxides The Verwey transition is not simple. Analogies with ice-Ih Anderson, Phys. Rev. 102 (1956) 1008–1013.

  8. Class 11, Fe3O4 and other iron oxides Scaling the summit: Very small crystals, magnetic fields, synchrotron x-ray … Senn, Wright, Attfield, Nature481 (2012) 173–176.

  9. Class 11, Fe3O4 and other iron oxides Scaling the summit: Very small crystals, magnetic fields, synchrotron x-ray … Senn, Wright, Attfield, Nature481 (2012) 173–176.

  10. Class 11, Fe3O4 and other iron oxides Scaling the summit: Very small crystals, magnetic fields, synchrotron x-ray … “Charge, orbital and trimeron order in the low-temperature magnetite structure: d: Trimeron distribution in the low-temperature magnetite structure. The trimerons are mainly end-linked through Fe3+ions, but one trimeron is terminated by an Fe2+ ion (circled). Some Fe3+sites do not participate in any trimerons.” Senn, Wright, Attfield, Nature481 (2012) 173–176.

  11. Class 11, Fe3O4 and other iron oxides SrFeO3 is a metal. CaFeO3 charge-disproportionates: Woodward, Cox, Moshopoulou, Sleight, Morimoto, Phys. Rev. B.62 (2000) 844–855.

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