Preferential surface oxidation of Gd in Gd5Ge4

► Gd undergoes preferential oxidation at the (010) surface of Gd5Ge4, a model magnetocaloric material. ► The oxide covers or replaces Ge at the surface. ► Oxidation in vacuum is more extensive at 600K than at 300K. Gd oxidizes preferentially at the (010) surface of Gd5Ge4. This is consistent with th...

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Veröffentlicht in:	Applied surface science 2012-01, Vol.258 (7), p.2757-2760
Hauptverfasser:	Yuen, Chad D., Miller, Gordon J., Thiel, Patricia A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Binary alloy Binding energy Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Displacement Exact sciences and technology Gadolinium oxides Germanium Oxidation Oxides Physics Thermodynamics X-ray photoelectron spectroscopy
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Zusammenfassung:	► Gd undergoes preferential oxidation at the (010) surface of Gd5Ge4, a model magnetocaloric material. ► The oxide covers or replaces Ge at the surface. ► Oxidation in vacuum is more extensive at 600K than at 300K. Gd oxidizes preferentially at the (010) surface of Gd5Ge4. This is consistent with thermodynamic data for the bulk oxides. Upon oxidation in vacuum, the gadolinium oxide displaces or covers the Ge. Oxidation is more extensive at 600K than at 300K, because more oxygen is incorporated into the surface and the shift of the Gd binding energy is larger.
ISSN:	0169-4332 1873-5584
DOI:	10.1016/j.apsusc.2011.10.127