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A Room-Temperature Verwey-type Transition in Iron Oxide, Fe O. | LitMetric

AI Article Synopsis

  • Functional oxides that can change their properties under standard conditions are being explored for next-gen nanoelectronic devices, with vanadium dioxide (VO2) being a key example due to its metal-insulator transition at near-room temperatures.
  • This study introduces a new mixed-valent iron oxide with a unique FeO stoichiometry that undergoes a charge-ordering transition at around 275 K, leading to the formation of new iron-iron bonds.
  • The research suggests that the distance between iron atoms in octahedral chains influences charge ordering, offering valuable insights into how charge-ordering works in transition-metal oxides.

Article Abstract

Functional oxides whose physicochemical properties may be reversibly changed at standard conditions are potential candidates for the use in next-generation nanoelectronic devices. To date, vanadium dioxide (VO ) is the only known simple transition-metal oxide that demonstrates a near-room-temperature metal-insulator transition that may be used in such appliances. In this work, we synthesized and investigated the crystals of a novel mixed-valent iron oxide with an unconventional Fe O stoichiometry. Near 275 K, Fe O undergoes a Verwey-type charge-ordering transition that is concurrent with a dimerization in the iron chains and a following formation of new Fe-Fe chemical bonds. This unique feature highlights Fe O as a promising candidate for the use in innovative applications. We established that the minimal Fe-Fe distance in the octahedral chains is a key parameter that determines the type and temperature of charge ordering. This model provides new insights into charge-ordering phenomena in transition-metal oxides in general.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7154779PMC
http://dx.doi.org/10.1002/anie.201914988DOI Listing

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