Direct measurement of Ni incorporation into Fe3O4(001)

P. T. P. Ryan; Z. Jakub; J. Balajka; J. Hulva; M. Meier; J. T. Küchle; P. J. Blowey; P. Kumar Thakur; C. Franchini; D. J. Payne; D. P. Woodruff; L. A. Rochford; F. Allegretti; T.-L. Lee; G. S. Parkinson; D. A. Duncan

doi:10.1039/C8CP02516A

Direct measurement of Ni incorporation into Fe₃O₄(001)†

P. T. P. Ryan,^ab Z. Jakub,^c J. Balajka,^c J. Hulva,^c M. Meier,^cd J. T. Küchle,^ae P. J. Blowey,^af P. Kumar Thakur,

^a C. Franchini,

^d D. J. Payne,

^b D. P. Woodruff,

^f L. A. Rochford,^g F. Allegretti,

^e T.-L. Lee,^a G. S. Parkinson

^c and D. A. Duncan

*^a

Author affiliations

* Corresponding authors

^a Diamond Light Source, Harwell Science and Innovation Campus, Didcot, UK
E-mail: david.duncan@diamond.ac.uk

^b Department of Materials, Imperial College London, South Kensington, London, UK

^c Institute of Applied Physics, Technische Universität Wien, 1040 Vienna, Austria

^d University of Vienna, Faculty of Physics and Center for Computational Materials Science, 1090 Vienna, Austria

^e Physics Department E20, Technical University of Munich, 85748 Garching, Germany

^f Department of Physics, University of Warwick, Coventry, UK

^g School of Chemistry, University of Birmingham, Birmingham, 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.

This article is part of the themed collection: 2018 PCCP HOT Articles

Physical Chemistry Chemical Physics

Direct measurement of Ni incorporation into Fe₃O₄(001)†

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