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We have investigated the chemical bonding states at the surfaces of La1.5Ba0.5SrCu2O6-d annealed under CO, CO2 and SO2 gaseous conditions, by using X-ray photoelectron spectroscopy (XPS). The C 1s and S 2p core-level data obtained from XPS indicate that each adsorbate exists as CO3δ- and SO4δ- on the reaction surfaces, respectively. The Cu 2p XPS spectra suggest that the reaction surfaces of the cuprate donate the electrons to the adsorbates and that the hybridizations of Cu(3d)-O(2p) orbitals change.

Adsorption States of Carbonate and Sulfate at the Surface of La1.5Ba0.5SrCu2O6-d.