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Cobalt Oxide/Silica Xerogels Powders: X-Ray Diffraction, Infrared and Visible Absorption Studies

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Abstract

Using x-ray diffraction, infrared and visible absorption spectroscopies we have studied: silica xerogel powders when cobalt nitrate is incorporated and mainly the evolution of the precipitated cobalt species in the SiO2 matrix. Samples containing cobalt nitrate and prepared with a molar ratio of H2O/TEOS of 11.67 were studied as a function of annealing temperature. It was found that the added element has a remarkable influence on the final structure of this kind of samples and at relatively high temperatures the cobalt compounds react with the silica matrix forming a cobalt silicate.

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Authors and Affiliations

  1. Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, 78000, San Luis Potosí, S.L.P., México

    G. Ortega-Zarzosa, C. Araujo-Andrade, M.E. Compeán-Jasso & J.R. Martínez

  2. Instituto Potosino de Investigación en Ciencia y Tecnología, 78216, San Luis Potosí, SLP, México

    F. Ruiz

Authors
  1. G. Ortega-Zarzosa
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  2. C. Araujo-Andrade
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  3. M.E. Compeán-Jasso
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  4. J.R. Martínez
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  5. F. Ruiz
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Ortega-Zarzosa, G., Araujo-Andrade, C., Compeán-Jasso, M. et al. Cobalt Oxide/Silica Xerogels Powders: X-Ray Diffraction, Infrared and Visible Absorption Studies. Journal of Sol-Gel Science and Technology 24, 23–29 (2002). https://doi.org/10.1023/A:1015105414916

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