Effect of molybdenum oxide addition on the durability and structure of iron phosphate glasses

Hiromichi TAKEBE, Masaharu FUJISAWA, Yuta MAEDA, Akira SAITOH
2021 Journal of the Ceramic Society of Japan  
Molybdenum oxide (MoO 3 )-containing iron phosphate (FeP) glasses with an analyzed Fe/P molar ratio of 0.41 0.43 and 043 mol % MoO 3 were prepared via a conventional melt-quenching method. The X-ray diffraction analysis revealed that all prepared samples had an X-ray non-crystalline state with a halo pattern. The dependency of the MoO 3 concentration on the glass transition temperature and water durability were evaluated. The water durability was examined in terms of glass plates with
more » ... ates with dimensions of 10 © 10 © 3 mm 3 via a static leaching test at 120°C for 72 h using ultrapure water. Raman spectroscopy was used for the analysis of the PO 4 Q n structures (n = 0, 1, 2) and the Mo 5+ /Mo 6+ species. The FeP glasses containing 817 mol % MoO 3 consisted mainly of PO 4 Q 1 structural units as well as both Mo 5+ O 6 distorted octahedra and Mo 6+ O 6 octahedra and a Ferelated polyhedra with a minimization of POP and MoOMo bonds. These structural features were qualitatively related to the improved properties of both thermal stability against crystallization and water durability for the MoO 3 -containing FeP glasses.
doi:10.2109/jcersj2.20199 fatcat:kkirlvheuvfpdemkvkwrsghc5q