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• W1993594844 abstract "Scanning tunneling microscopy (STM) has been used to image the (111) surface of magnetite (${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$), following argon-ion bombardment and annealing in ${mathrm{O}}_{2}$. The (1ifmmodetimeselsetexttimesfi{}1) hexagonal low-energy electron-diffraction (LEED) pattern obtained from this surface is consistent with a bulk-terminated ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ (111) surface. STM images show two distinct coexisting surface terminations having identical hexagonal unit-cell dimensions and orientations. We designate these terminations $A$ and $B$. Termination $A$ shows close-packed features separated by 6.1ifmmodepmelsetextpmfi{}0.2 AA{}, while termination $B$ shows features separated by 3.6ifmmodepmelsetextpmfi{}0.4 AA{} which are arranged in a honeycomb pattern. The step height from termination $A$ down to termination $B$ is 3.8ifmmodepmelsetextpmfi{}0.5 AA{}, while that from termination $B$ down to termination $A$ is 0.5ifmmodepmelsetextpmfi{}0.2 AA{}. A model is proposed which identifies these terminations with the two types of Fe(111) layers found in the bulk ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ structure. Termination $A$ corresponds to an unreconstructed (111) termination of ${mathrm{Fe}}_{3}$${mathrm{O}}_{4}$ that exposes $frac{3}{4}$ ML of Fe atoms and textonequarter{} ML of O atoms over a close-packed O layer, with each feature arising from a trimer of Fe atoms capped by an O atom. Termination $B$ corresponds to an unreconstructed (111) termination that exposes textonehalf{} ML of Fe atoms over a close-packed O layer; each feature is due to a single Fe atom. Ionic and covalent models of surface stability indicate that the atomic arrangement proposed for termination $B$ would be more stable than that for termination $A$." @default.
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• W1993594844 date "1996-04-15" @default.
• W1993594844 modified "2023-10-11" @default.
• W1993594844 title "Structures of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(111) surfaces observed by …" @default.
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• W1993594844 doi "https://doi.org/10.1103/physrevb.53.10244" @default.
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