SHORT RANGE ORDER IN SILVER BORATE GLASSES
1985; EDP Sciences; Volume: 46; Issue: C8 Linguagem: Inglês
10.1051/jphyscol
ISSN2777-3418
AutoresG. Dalba, P. Fornasini, F. Rocca,
Tópico(s)Solid-state spectroscopy and crystallography
Resumod i Fisica d e g l i s t a t i aggregati e impianto i o n i c o d e l CNR, 1-38050 Povo (TN'N), I t a l yRQsumE -La coordination N du cation Ag dans les verres Ag2 0 -B2 O3 a QtB Gtudi6e par EXAFS.On trouve N voisin de 2 et un fact€ Debye-Walker qui suggPrent que l'ordre 2 courte distance des liaisons Ag-0 est 616~6.Ceci diffQrencie les verres boratgs des verrc sod6s.L'addition de Ag I ne modifie pas sensiblement la coordination Ag-0 et la coordination Ag-I est voisine de 4.Abstract -The coordination of the silver cation in the glasses Ag20 n B203has been studied by EXAF' S.The values of coordination number ( N ' 2 )and Debye-Waller factor denote an high degree of short range order in the bond Ag-0.This differentiates silver borate glasses from sodium borate glasses.When the glasses are doped with AgI, the Ag-0 coordination is found to remain substantially unmodified.The coordination Ag-I is 4-fold.
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