Vol. 33, Issue 1, pp. 125-132 (2003)

Abstract

X-ray absorption spectroscopy (XAS) measurements for Ca₃Ga₂Ge₃O₁₂ and Ca₃Ga₂Ge₄O₁₄ glasses are presented. In particular, the extended X-ray absorption fine structure (EXAFS) spectra are analysed and local neighbourhood of Ga and Ge atoms is described in detail. The Ge/Ga atoms neighbourhood in considered glasses is compared with the data available for corresponding crystals. Performed comparative crystal-glass structural analysis confirms correlation between crystalline and glassy structures of the Ca₃Ga₂Ge₃O₁₂ and Ca₃Ga₂Ge₄O₁₄ compounds. Our results provide several new detailed data, and some general suggestions on the CaO–Ga₂O_3–GeO₂ glass structure.