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.
Direct measurement of Ni incorporation into Fe3O4(001) / Ryan, P.T.P.; Jakub, Z.; Balajka, J.; Hulva, J.; Meier, M.; Küchle, J.T.; Blowey, P.J.; Thakur, P. Kumar; Franchini, C.; Payne, D.J.; Woodruff, D.P.; Rochford, L.A.; Allegretti, F.; Lee, T.-L.; Parkinson, G.S.; Duncan, D.A.*. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - STAMPA. - 20:24(2018), pp. 16469-16476. [10.1039/c8cp02516a]
Direct measurement of Ni incorporation into Fe3O4(001)
Franchini, C.Membro del Collaboration Group
;
2018
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
