ISSN:
1432-0630
Schlagwort(e):
71.20
;
71.55
;
73
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
,
Physik
Notizen:
Abstract The electronic properties of Ar-ion and electron bombarded single-crystal surfaces of LiNbO3 have been investigated at room temperature by ultraviolet photoelectron spectroscopy (UPS) and x-ray excited photoelectron spectroscopy (XPS). In crystals reduced in this way, the loss of oxygen is accompanied with a loss of lithium and the creation of Nb4+ and Nb3+ ions. The relative concentrations of the various defects have been determined from their corresponding XPS core line spectra. When surface defects are produced an emission in the region of the bulk band gap appears. This gap emission is identified as arising from Nb 4d electrons due to the reduction of Nb5+ ions to Nb4+ and Nb3+ ions. The different behaviour of the gap emission upon surface treatment in the UPS and the XPS spectra is discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00895926
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