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000877787 1001_ $$00000-0002-6563-6072$$aTober, Steffen$$b0$$eFirst author
000877787 245__ $$aObservation of iron diffusion in the near-surface region of magnetite at 470 K
000877787 260__ $$aCollege Park, MD$$bAPS$$c2020
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000877787 520__ $$aExperiments are reported, which allow us to quantify the near-surface cation diffusion in (001) oriented Fe$_3$O$_4$ single crystals at temperatures between 470 and 770 K. Thin homoepitaxial films of magnetite, grown using isotopically labeled $^{57}$Fe, were investigated by neutron reflectivity and time-of-flight secondary ion mass spectrometry. By heating the thin films in high vacuum to different temperatures for a well-defined time and determining the ${57}$ Fe distribution along the surface normal, the diffusion lengths are obtained. For the investigated temperature range, diffusion constants of the order of 10$^{−20}$ m$^2$/s are deduced. These results are important in view of near-surface mass transport induced by oxygen chemical potential differences occurring when magnetite is exposed to different gas atmospheres or by adsorbates.
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000877787 7001_ $$00000-0002-3639-6049$$aCreutzburg, Marcus$$b1
000877787 7001_ $$00000-0002-2761-3486$$aArndt, Björn$$b2
000877787 7001_ $$00000-0002-8838-287X$$aKrausert, Konstantin$$b3
000877787 7001_ $$0P:(DE-Juel1)130821$$aMattauch, Stefan$$b4
000877787 7001_ $$0P:(DE-Juel1)158075$$aKoutsioubas, Alexandros$$b5
000877787 7001_ $$0P:(DE-Juel1)142052$$aPütter, Sabine$$b6
000877787 7001_ $$00000-0002-7599-7402$$aMohd, Amir Syed$$b7
000877787 7001_ $$0P:(DE-HGF)0$$aVolgger, Lukas$$b8
000877787 7001_ $$0P:(DE-HGF)0$$aHutter, Herbert$$b9
000877787 7001_ $$0P:(DE-HGF)0$$aNoei, Heshmat$$b10
000877787 7001_ $$00000-0001-9854-1101$$aVonk, Vedran$$b11
000877787 7001_ $$00000-0002-7301-1873$$aLott, Dieter$$b12
000877787 7001_ $$00000-0002-0303-6282$$aStierle, Andreas$$b13$$eCorresponding author
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