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Sol-gel synthesis of TeO2-based materials using citric acid as hydrolysis modifier

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Abstract

Sol-gel processing of tellurium oxide has been investigated in the tellurium isopropoxide/citric acid/isopropanol/water system. As evidenced by Fourier transformed infrared spectroscopy (FTIR), citric acid has been found to be a relevant chemical modifier to control hydrolysis-condensation reactions of highly reactive tellurium isopropoxide Te(OCH(CH3)2)4. Thus, depending on the main synthesis chemical parameters such as alkoxide concentration, water and modifier ratios, colloidal sols and gels have been successfully synthesised. The thermal behaviour of the dried gels has been investigated by X-ray diffraction, differential scanning calorimetry coupled with thermogravimetry and also FTIR spectroscopy. On the one hand, the crystallisation of the non-centrosymmetric γ-TeO2 polymorph as well as the α-TeO2 phase which the crystallite size ranges from a few ten nanometers (∼50 nm) to a few microns as a function of heat treatment, and, on the other hand, the synthesis of homogeneous sols which can be handled in air and so particularly suitable for the elaboration of thin films provide new opportunities for making tellurite based materials and thin film devices for practical applications.

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Authors and Affiliations

  1. Laboratoire “Science des Procédés Céramiques et de Traitements de Surface”, UMR 6638 CNRS, Université de Limoges-Faculté des Sciences et Techniques, 123-127, avenue Albert Thomas, 87065, Limoges Cedex, France

    S. Coste, P. Thomas, T. Merle-Mejean & J. C. Champarnaud-Mesjard

  2. Laboratoire “Science des Procédés Céramiques et de Traitements de Surface”, UMR 6638 CNRS, ENSCI, 47-73, avenue Albert Thomas, 87060, Limoges Cedex, France

    A. Lecomte

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  1. S. Coste
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  2. A. Lecomte
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  3. P. Thomas
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  4. T. Merle-Mejean
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  5. J. C. Champarnaud-Mesjard
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Correspondence to P. Thomas.

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Coste, S., Lecomte, A., Thomas, P. et al. Sol-gel synthesis of TeO2-based materials using citric acid as hydrolysis modifier. J Sol-Gel Sci Technol 41, 79–86 (2007). https://doi.org/10.1007/s10971-006-0117-6

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  • DOI: https://doi.org/10.1007/s10971-006-0117-6

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