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Issue 20, 2018
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Proton transfer ferroelectricity/multiferroicity in rutile oxyhydroxides

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Oxyhydroxide minerals such as FeOOH have been a research focus in geology for studying the Earth's interior, and also in chemistry for studying their oxygen electrocatalysis activity. In this paper the first-principle evidence of a new class of ferroelectrics/multiferroics is given. In this class are: β-CrOOH (guyanaite), ε-FeOOH, β-GaOOH, and InOOH, which are earth-abundant minerals which have been experimentally verified to possess distorted rutile structures, are ferroelectric with considerable polarizations (up to 24 μC cm−2) and piezoelectric coefficients. Their atomic-thick layer may possess vertical polarization will not be diminished by depolarizing field because of the formation of O–H⋯O bonds that can be hardly symmetrized. Furthermore, β-CrOOH is revealed to be a combination of a high Curie temperature (TC) in-plane type-I multiferroics and vertical type-II multiferroics, which is strain tunable and may give a desirable coupling between magnetism and ferroelectricity. Supported by experimental evidence on reversible conversion between metal oxyhydroxides and dioxides and their good lattice match that gives convenient epitaxial growth, a heterostructure composed of oxyhydroxides and common metal dioxides (e.g., TiO2, SnO2 and CrO2) may be constructed for various applications such as ferroelectric field-effect transistors and multiferroic tunneling junctions.

Graphical abstract: Proton transfer ferroelectricity/multiferroicity in rutile oxyhydroxides

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The article was received on 20 Feb 2018, accepted on 04 Apr 2018 and first published on 04 Apr 2018

Article type: Paper
DOI: 10.1039/C8NR01456F
Citation: Nanoscale, 2018,10, 9509-9515
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    Proton transfer ferroelectricity/multiferroicity in rutile oxyhydroxides

    M. Wu, T. Duan, C. Lu, H. Fu, S. Dong and J. Liu, Nanoscale, 2018, 10, 9509
    DOI: 10.1039/C8NR01456F

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