EPR STRUCTURAL CHARACTERIZATION OF SOME ALKALI PHOSPHATE-GLASSES

Authors
BOUDLICH D YAHIAOUI EM ARCHIDI ME HADDAD M NADIRI A BERGER R
Citation
D. Boudlich et al., EPR STRUCTURAL CHARACTERIZATION OF SOME ALKALI PHOSPHATE-GLASSES, Annales de chimie, 23(1-2), 1998, pp. 113-116
Citations number
17
Categorie Soggetti
Chemistry,"Material Science
Journal title
Annales de chimie → ACNP
ISSN journal
01519107
Volume
23
Issue
1-2
Year of publication
1998
Pages
113 - 116
Database
ISI
SICI code
0151-9107(1998)23:1-2<113:ESCOSA>2.0.ZU;2-Z
Abstract
It is known that W5+, Mo5+, and Fe3+ ions are sensitive indicators for the structural changes of the local symmetry in oxide glasses. Thus, these centres were used as EPR probes in P2O5-A(2)MO(4)-A(2)O (M=Mo, W and A=Li, Na). The M5+ ions are located in a distorted environment. T heir symmetry is lowered as A(2)O content is high. In iron-dopped glas ses Fe3+ centres occupy distorted octahedra. The distortion extent is less than 7%. Radiation-induced defects have been detected, it is conc erned with a PO42- centre and peroxy radicals.