Surface structure of iron phosphate glasses with ultra-high chemical durability by X-ray photoelectron spectroscopy

Yano, Tetsuji*; Akagi, Naoto*; Shibata, Shuichi*; Amamoto, Ippei

In order to clarify the origins of the high chemical durability of iron phosphate glasses and find more stable glass composition, the transition metal oxides were added by the replacement of a part of the iron oxide, prepared the glasses by melt-quenching method and their thermal properties and chemical durabilities were measured. The structures of the glasses and their surfaces were analyzed using X-ray photoelectron spectroscopy. The bulk samples were fractured in vacuum to obtain pristine surfaces, and the photoelectrons emitted from the analyzed surface by the monochromatic X-ray irradiation were collected. From the result, the dissolution rates of the sample glasses were correlated with the structural factors obtained from the XPS data, and strong correlations with the chemical shifts of the core electron spectra of oxygen and phosphorus ions were found, which are on the different trends found in general phosphate glass system like alkali phosphate glass.