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Formation of silicate structures in Cu-containing silica xerogels

Published online by Cambridge University Press:  31 January 2011

F. Ruiz ,
J. R. Martínez  and
J. González-Hernández
F. Ruiz
Affiliation:
Instituto de Fíica “Manuel Sandoval Vallarta,” Universidad Autónoma de San Luis Potosí, 78000 San Luis Potosí, S.L.P., Mexico
J. R. Martínez
Affiliation:
Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, 78000 San Luis Potosí, S.L.P., Mexico
J. González-Hernández
Affiliation:
Centro de Investigación y de Estudios Avanzados del IPN, Unidad Querétaro, Apdo. Postal 1–1010, C.P. 76010, Querétaro, Qro., Mexico
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Abstract

Using infrared absorption and Raman spectroscopy, the structure of SiO2 sol-gel samples containing copper were analyzed as a function of air heat treatments. The weight composition of the samples was 70(SiO2)–30(CuO) and the thermal treatments were carried out in air at various temperatures in the range of 100–600 °C. It was found that the Cu might be incorporated into the SiO2 matrix at least in two ways: forming oxide particles and forming metasilicatelike structures. The copper metasilicate found had the chemical formula, Cu6 [Si6O18] · 6H2O, which is known as dioptase with a thermal stability at temperatures up to 600 °C.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 12 , December 2000 , pp. 2875 - 2880
Copyright
Copyright © Materials Research Society 2000

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