Abstract
Valence band structure of sintered AgSbO 3 with defect pyrochlore structure was examined using ultraviolet photoemission spectroscopy (UPS). The upper valence band has a structure with peaks at the binding energies of 2.5 eV, 3.5 eV, 5.5 eV, and 7.5 eV. Constant initial state (CIS) spectra measured on these peaks demonstrated that the upper valence bands are mainly composed of the mixture of occupied O 2 p and Ag 4 d orbitals. Even the top of valence band with the peak at 2.5 eV includes a significant amount of Ag 4 d component. The present result suggests that this material is a good candidate as a novel wide gap and p-type conductive oxide.
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