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Raman study of copper and iron oxide particles embedded in an SiO2 matrix

✍ Scribed by F. Pérez-Robles; F. J. García-Rodríguez; S. Jiménez-Sandoval; J. González-Hernández

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
128 KB
Volume
30
Category
Article
ISSN
0377-0486

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✦ Synopsis

The structure of heat-treated sol-gel-made SiO 2 samples containing copper or iron in various amounts was studied using Raman spectroscopy and x-ray diffraction. The treatments were in air in the temperature range 200-800 • C. Copper and iron concentrations were in the range 7-55 wt%. It was found that in the samples containing copper, the metal is mainly dissolved in the SiO 2 network when the thermal treatment is at low temperatures. For higher annealing temperatures, first a copper silicate is formed and then most of the copper forms cupric oxide particles at temperatures of about 800 • C. In samples containing iron, the formation of particles with nanometric size of the g-Fe 2 O 3 (maghemite) phase is observed after annealing at 500 • C. At 800 • C the maghemite phase is transformed into the stable hematite (a-Fe 2 O 3 ) phase.

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