Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 79, Issue 1, Pages 12-28Publisher
SPRINGER
DOI: 10.1007/s10971-016-4029-9
Keywords
Sol-gel; Te(VI) acid; Composite materials; IR; UV-Vis spectra
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Funding
- Ministry of Education and Science of Bulgaria, Operational Program Human Resources Development
- European Social Fund of the European Union [BGO51PO001-3.3.06-0050]
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The aim of this paper is to study the gel formation tendency in the TiO2-TeO2-SeO2 system. Telluric acid (H6TeO6), selenous acid (H2SeO3) and titanium butoxide were used as precursors dissolved in ethylene glycol. Transparent monolithic and bright yellow colored gels are situated between 40-100 mol% TiO2, up to 20 mol% SeO2 and 65 mol% TeO2. The phase transformations of the as-prepared gels heat-treated up to 700 degrees C are investigated by XRD. The chemical states of C, Ti, Se and Te are characterized by means of XPS. Organic and OH groups participate in the amorphous organic-inorganic structure up to 250-300 degrees C. The structure of the inorganic amorphous phases above 300 degrees C consists of SeO3, TiO6 and TeOn structural units. The UV-Vis spectra of the binary and three-component gels exhibited a redshift of the cutoff in comparison with those of Ti butoxide gel due to the presence of selenium and tellurium units.
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