PHOTOEMISSION-STUDY OF THE ELECTRONIC-STRUCTURE OF BAPB1-XBIXO3

Synchrotron-excited photoemission is used to explore the evolution in the electronic structure of the BaPb1-xBixO3 system as a function of x , using cleaved single crystal and scraped ceramic samples. At the met al-to-non-metal transition point, a sharp change in surface reactivity is revealed, with metallic samples being more unstable to atmospheric degradation than semiconducting samples. ARPES data shows enhancement s in spectral intensity at the Fermi energy away from the Gamma-point; these are compared with band-structure calculations.