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Local coordination geometry around Cu and Cu ions in silicate glasses: an X-ray absorption near edge structure investigation |
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| Authors: | C Maurizio F d'Acapito M Benfatto S Mobilio E Cattaruzza F Gonella |
| Institution: | (1) INFM, Dipartimento di Fisica, Università di Padova, Via Marzolo 8, 35131 Padova, Italy, IT;(2) INFM Grenoble Operative Group c/o European Synchrotron Radiation Facility, GILDA CRG,BP 220, 38043 Grenoble, France, FR;(3) European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France, FR;(4) Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, P.O. Box 13, 00044 Frascati, Italy, IT;(5) Università“Roma Tre", Dipartimento di Fisica, Via della Vasca Navale 84, 00146 Roma, Italy, IT;(6) INFM, Dipartimento di Chimica Fisica, Università di Venezia, Dorsoduro 2137, 30123 Venezia, Italy, IT |
| Abstract: | We present an X-ray absorption near edge structure (XANES) study on Cu+ and Cu2+ ions in silicate glasses at the Cu K-edge, aimed to determine the geometry of the local structure around the metal. This study is based on the comparison between experimental data and theoretical calculations made in the framework of multiple scattering theory. The XANES signals relative to several clusters are simulated on the basis of known crystalline structures involving Cu+ and Cu2+ ions in silicate matrices. Concerning the Cu2+ in glass, the simulations suggest the presence of a square coordination of oxygen atoms around the absorber, with a possible presence of metal ions in the second shell. As for the Cu+ ions, the metal clustering is excluded and a linear O-Cu-O coordination is evidenced. Received 30 April 1999 |
| Keywords: | PACS 61 10 Ht X-ray absorption spectroscopy: EXAFS NEXAFS XANES etc - 61 43 Fs Glasses - 85 40 Ry Impurity doping diffusion and ion implantation technology |
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