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A Room-Temperature Verwey-type Transition in Iron Oxide, Fe5O6

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Medvedev,  Sergey A.
Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Naumov,  Pavel G.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Ovsyannikov, S. V., Bykov, M., Medvedev, S. A., Naumov, P. G., Jesche, A., Tsirlin, A. A., et al. (2020). A Room-Temperature Verwey-type Transition in Iron Oxide, Fe5O6. Angewandte Chemie International Edition, 59, 5632 -5636. doi:10.1002/anie.201914988.


Cite as: http://hdl.handle.net/21.11116/0000-0005-A1EC-B
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 (VO2) 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 Fe5O6 stoichiometry. Near 275 K, Fe5O6 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 Fe5O6 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. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.