OXIDATION-STATE OF MANGANESE IONS IN SILICATE GELS AND GEL-DERIVED GLASSES

Authors
DASILVA MG ROCHA J
Citation
Mg. Dasilva et J. Rocha, OXIDATION-STATE OF MANGANESE IONS IN SILICATE GELS AND GEL-DERIVED GLASSES, Physics and Chemistry of Glasses, 39(1), 1998, pp. 41-44
Citations number
11
Categorie Soggetti
Material Science, Ceramics","Chemistry Physical
Journal title
Physics and Chemistry of Glasses → ACNP
ISSN journal
00319090
Volume
39
Issue
1
Year of publication
1998
Pages
41 - 44
Database
ISI
SICI code
0031-9090(1998)39:1<41:OOMIIS>2.0.ZU;2-1
Abstract
In the present work 0.5MnO-99.5 SiO2, 0.5MnO-5Al(2)O(3) and 0.5MnO-5Ca O-94.5SiO(2) gels and gel derived glasses prepared by using tetraethyl orthosilicate (TEOS) and manganese, calcium and aluminium nitrates as starting materials were studied. The gel samples were heat treated bet ween 60 and 800 degrees C and examined by visible spectrophotometry (V IS), Al-27 and Si-29 magic angle spinning nuclear magnetic resonance ( MAS-NMR) and Mn2+ electron paramagnetic resonance spectroscopy (EPR). These techniques were used to determine the structural role of Cd2+ an d Al3+ on the structural incorporation of manganese.