Abstract
X-ray absorption near edge structure (XANES) measurements at the Si K-edge, X-ray photoelectron spectroscopy of the Si 2p and O 1s photoelectrons and X-ray excited Auger electron spectroscopy of the Si KLL Auger electrons are applied in order to investigate the degree of polymerisation (Q n ) of the (SiO 4)-polyhedra in barium silicate glasses with different BaO-contents. The spectra of the glasses with 33.3 and 37.0 mol% BaO are compared to those of the crystalline reference compounds: low quartz, BaSi 2O 5, BaSiO 3 and Ba 2SiO 4. The analysis reveals a high average polymerisation between Q 3 and Q 4 in both glasses. The results are supported by calculations of the bound state transitions in Si K-XANES using the multiple scattering Xα method.
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