Browsing by Author "Calas G."
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Browsing by Author "Calas G."
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CATIONIC ENVIRONMENT IN SILICATE GLASSES STUDIED BY NEUTRON DIFFRACTION WITH ISOTOPIC SUBSTITUTION Cormier L.; Calas G.; Gaskell P.H. (2001)The method of neutron diffraction coupled with isotopic substitution is presented and recent investigations on the environment around cations in silicate (Ti in K2O.TiO2.2SiO2, Ca and Ni in 2CaO.NiO.3SiO2) and aluminosilicate ...
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CRYSTAL FIELD SPECTROSCOPY OF CR3+ IN GLASSES: COMPOSITIONAL DEPENDENCE AND THERMAL SITE EXPANSION Calas G.; Majérus O.; Galoisy L.; Cormier L. (2006)Optical absorption (= crystal field) spectra of Cr3+ in silicate glasses have been investigated as a function of chemical composition and temperature. In a large range of glass compositions, most spectra show a variation ...
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Juillot F.; Morin G.; Ildefonse P.; Calas G.; Brown Jr G.E. (2006)EXAFS spectroscopy has been used to determine the medium-range structural environment (within a radius of ≈7 Å) of trace levels of Zn2+ ions within the octahedral sheets of trioctahedral 2:1 phyllosilicates. EXAFS signatures ...
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Galoisy L.; Calas G.; Arrio M.A. (2001)High-resolution X-ray Absorption Near-Edge Structure (XANES) spectra of iron allow to take into account the effects of the coordination numbers on the quantification of redox values. Volcanic glasses show split pre-edge ...
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Gehlen M.; Beck L.; Calas G.; Flank A.M.; van Bennekom A.J.; Van Beusekom J.E.E. (2002)We used X-ray absorption spectroscopy at the Al K-edge to investigate the atomic structure of biogenic silica and to assess the effect of Al on its crystal chemistry. Our study provides the first direct evidence for a ...
Now showing items 1-5 of 5