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A Room-Temperature Verwey-type Transition in Iron Oxide, Fe5 O6.


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 Fe5 O6 stoichiometry. Near 275?K, Fe5 O6 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 Fe5 O6 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.

SUBMITTER: Ovsyannikov SV 

PROVIDER: S-EPMC7154779 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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A Room-Temperature Verwey-type Transition in Iron Oxide, Fe<sub>5</sub> O<sub>6</sub>.

Ovsyannikov Sergey V SV   Bykov Maxim M   Medvedev Sergey A SA   Naumov Pavel G PG   Jesche Anton A   Tsirlin Alexander A AA   Bykova Elena E   Chuvashova Irina I   Karkin Alexander E AE   Dyadkin Vadim V   Chernyshov Dmitry D   Dubrovinsky Leonid S LS  

Angewandte Chemie (International ed. in English) 20200130 14


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<sub>2</sub> ) 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<su  ...[more]

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