Direct measurement of Ni incorporation into Fe3O4(001)
P T P Ryan1, Z Jakub, J Balajka
1Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK. david.duncan@diamond.ac.uk.
Abstract:
The normal incidence X-ray standing wave (NIXSW) technique has been used to follow the evolution of the adsorption geometry of Ni adatoms on the Fe3O4(001)-(√2 × √2)R45° surface as a function of temperature. Two primary surface region sites are identified: a bulk-continuation tetrahedral site and a sub-surface octahedral site, the latter site being preferred at higher annealing temperatures. The ease of incorporation is linked to the presence of subsurface cation vacancies in the (√2 × √2)R45° reconstruction and is consistent with the preference for octahedral coordination observed in the spinel compound NiFe2O4.
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