Pulsed neutron diffraction study on the short range structure of B2O3-Ag2Oglasses

Citation
H. Ushida et al., Pulsed neutron diffraction study on the short range structure of B2O3-Ag2Oglasses, J ALLOY COM, 327(1-2), 2001, pp. 121-126
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
0925-8388 → ACNP
Volume
327
Issue
1-2
Year of publication
2001
Pages
121 - 126
Database
ISI
SICI code
0925-8388(20010830)327:1-2<121:PNDSOT>2.0.ZU;2-I
Abstract
The short range structure of (1-x)B2O3-xAg(2)O (x=0.05-0.30) glasses was in vestigated by time-of-flight neutron scattering experiments. Radial distrib ution analyses were applied to extract the structural information. but the structural parameters for each atomic pair were finally optimized in the Q- space. The bond distances of near neighbor B-O pairs were estimated at 0.13 8 and 0.145 nm, and the corresponding coordination numbers were 3 and 4, re spectively. These were ascribed to the B-O correlations in distorted six-me mbered rings consisting of planer trigonal units and tetrahedral ones. The silver atoms serve to hold the networks together through coordination with oxygen atoms, thereby the nearly octahedral arrangements of oxygen atoms ar ound a silver atom were found to exist in these glasses. The octahedral uni ts were distorted to such an extent that the Ag-O distances were ranging fr om 0.25 to 0.32 nm. The existence of medium range order was also confirmed in the structure factor S(Q) over the composition range of this work. (C) 2 001 Elsevier Science B.V. All rights reserved.