Browsing by Author "Calas G."

Now showing items 1-3 of 3

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 ...
HIGH-RESOLUTION XANES SPECTRA OF IRON IN MINERALS AND GLASSES: STRUCTURAL INFORMATION FROM THE PRE-EDGE REGION

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 ...
UNRAVELING THE ATOMIC STRUCTURE OF BIOGENIC SILICA: EVIDENCE OF THE STRUCTURAL ASSOCIATION OF AL AND SI IN DIATOM FRUSTULES

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 ...

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