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Influence of temperature and time on the stability of silver in silica sol-gel glasses

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Abstract

The darkening of silica sol-gel glasses doped with 0.05 mol% silver was studied. Six sols were prepared from TEOS and silver nitrate. Different additives were used, to influence the chemical and physical states of silver: oxidizing or reducing agents (H2O2, As2O5), colloid stabilizer (sodium citrate) and network modifiers (Li2O, CaO). Sols were gelified at 60°C and densified at 600°C. The samples without additives and those prepared with H2O2 at room temperature even if they were protected from light. With increased temperature, the darkening became samples were heated above, 400°C, reversible bleaching took place. This darkening-bleaching is of thermal nature (“thermochromic effect”) and seems to be determined by a reversible aggregation-disaggregation of tiny silver particles. The presence of sodium citrate, as an additive delayed the darkening effect and the presence of CaO delayed it even further. Lithium oxide inhibited it totally.

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Authors and Affiliations

  1. Glass Department, Instituto de Cerámica y Vidrio, C.S.I.C., 28500 Arganda del Rey, Madrid, Spain

    B. Ritzer, M. A. Villegas & J. M. Fernández Navarro

Authors
  1. B. Ritzer
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  2. M. A. Villegas
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  3. J. M. Fernández Navarro
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Ritzer, B., Villegas, M.A. & Fernández Navarro, J.M. Influence of temperature and time on the stability of silver in silica sol-gel glasses. J Sol-Gel Sci Technol 8, 917–921 (1997). https://doi.org/10.1007/BF02436960

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  • DOI: https://doi.org/10.1007/BF02436960

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