XAFS study of the local structure of (K2O-Al2O3)center dot 2B(2)O(3) and (CaO-Al2O3)center dot 2B(2)O(3) glasses

Authors
Handa, K Irie, M Iwasaki, H Ohtori, N Umesaki, N
Citation
K. Handa et al., XAFS study of the local structure of (K2O-Al2O3)center dot 2B(2)O(3) and (CaO-Al2O3)center dot 2B(2)O(3) glasses, PHYS C GLAS, 41(6), 2000, pp. 345-348
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
PHYSICS AND CHEMISTRY OF GLASSES
ISSN journal
00319090 → ACNP
Volume
41
Issue
6
Year of publication
2000
Pages
345 - 348
Database
ISI
SICI code
0031-9090(200012)41:6<345:XSOTLS>2.0.ZU;2-V
Abstract
We have studied the structure of (xK(2)O(.)yAl(2)O(3))(.)2B(2)O(3) (x+0.75, 0.5, 0.45, x+y=1) and (xCaO(.)yAl(2)O(3))(.)2B(2)O(3) (x=0.75, 0.5, 0.375, x+y=1) glasses by soft x-ray XAFS measurements. There are 6 oxygen atoms a round K and Ca in (CaO-Al2O3)(.)2B(2)O(3) glasses and K(2)O(.)2B(2)O(3) gla ss and 4.2-4.7 aroudn K in (K2O-Al2O3)(.)2B(2)O(3) glasses. The mean K-O an d Ca-O distances are 2.74-2.78 and 2.40-2.44 Angstrom, respectively. The fr action of AlO6 as AlO4 is 53.6% in (0.75 CaO(.)0.25 Al2O3)(.)2B(2)O(3) glas s and 23.3% in (0.375 CaO(.)0.625 Al2O3)(.)2B(2)O(3) glass, respectively. T hese results are in good agreement with our MD calculations.