x-ray absorption and photoemission electron spectroscopic investigation of crystalline and amorphous barium silicates：x射线吸收和结晶和无定形硅酸钡光电子光谱研究.pdf

Journal of Non-Crystalline Solids 298 (2002) 99–108 /locate/jnoncrysol X-ray absorption and photoemission electron spectroscopic investigation of crystalline and amorphous barium silicates S. Bender a, R. Franke a, E. Hartmann b, V. Lansmann c, M. Jansen c,d, J. Hormes a,e,* a € Physikalisches Institut, Universitaat Bonn, Nußallee 12, D-53115 Bonn, Germany b € € Institut fuur Oberflaachenmodifizierung, Permoserstr. 15, D-04303 Leipzig, Germany c Institut fuu€r Anorganische Chemie, Universitaa€t Bonn, Gerhard-Domagk-Str. 1, D-53121 Bonn, Germany d € € Max-Planck-Institut fuur Festkoorperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany e Center of Advanced Microstructures and Devices, 6980 Jefferson Highway, Baton Rouge, LA 70806, USA Received 25 May 1999; received in revised form 10 December 2001 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 (Qn ) of the (SiO )-polyhedra in barium silicate glasses with 4 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: lo