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Article Dans Une Revue Zeitschrift für Physikalische Chemie Année : 2016

Structure of Glassy Ag–Ge–Se by Neutron Diffraction with Isotope Substitution

Résumé

The structure of glassy Ag0.077Ge0.212Se0.711, which lies at y = 0.077 on the Agy(Ge0.23Se0.77)1−y tie-line, was investigated by using the method of neutron diffraction with silver isotope substitution. Two glass transition temperatures were found from a characterisation of the material using modulated differential scanning calorimetry, which indicates a mixed phase material. The diffraction method provides site-specific information on the Ag coordination environment, and gives an average of 3.5(1) Ag–Se nearest-neighbours with a bond distance of 2.65(1) Å together with 0.9(1) Ag–Ag next nearest-neighbours at a distance of 2.9(2) Å. The incorporation of silver does not appear to have a marked effect on the coordination number of Se to other matrix (Ge or Se) atoms, which supports the notion that Ag forms dative bonds with Se lone-pair electrons. A model is given for predicting the change in the Se to matrix atom coordination number when a monovalent metal such as Ag is added to a Se rich Ge–Se base glass.
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Dates et versions

hal-01273129 , version 1 (15-10-2020)

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Anita Zeidler, Philip S. Salmon, Andrea Piarristeguy, Annie Pradel, Henry E. Fischer. Structure of Glassy Ag–Ge–Se by Neutron Diffraction with Isotope Substitution. Zeitschrift für Physikalische Chemie, 2016, 230 (3), pp.417 - 432. ⟨10.1515/zpch-2015-0727⟩. ⟨hal-01273129⟩
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