CHARACTERIZATION OF THE SURFACES OF PHOSPHATES BY XPS

Abstract

Surface characterization of AlPO4 and BPO4 was carried out by XPS. The followings were verified. The surface acid-base property of amorpous AlPO4 was similar to that of Al2(SO4)3 but it was different from that of Al2O3. The amount of basic sites of amorpous AlPO4 was less than that of Al2O3, and the phosphorus and oxygen of amorpous AlPO4 surface partly desorbed when it was heat-treated in a vacuo. In addition, it was clarified that unreacte,d H3BO3 or its condensation compound, and P2O5-like phosphorus compounds remained on the surface of BPO4 as minor conponents.