ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 53, (3) 180 - 183 (2009)


SPECTROSCOPIC ANALYSIS OF IRON DOPED GLASSES WITH COMPOSITION CLOSE TO THE E-GLASS: A PRELIMINARY STUDY
 
Klement Róbert, Kraxner Jozef, Liška Marek
 
Vitrum Laugaricio – Joint Glass Centre of the Institute of Inorganic Chemistry, Slovak Academy of Sciences, Alexander Dubček University of Trenčín and RONA, a.s., Študentská 2, Trenčín, SK- 911 50, Slovak Republic

Keywords: UV-VIS-NIR, Optical spectroscopy, Iron, Redox state of glass, E-glass
 

The iron doped glasses with composition close to the commercially produced E-glass, approximated by a five component system MgO–CaO–B₂O₂–Al₂O₂–SiO₂, were studied by UV VIS NIR spectroscopy. The calibration of the absorbance with respect to Fe²⁺ concentration allowed to determine the extinction coefficient for Fe²⁺ species for this type of glasses; at 10000 cm⁻¹ was found to be 15.99 ± 0.09 dm³ .mol⁻¹.cm⁻¹. The iron redox ratio, Fe²⁺/ΣFe, was determined from the spectra. It was found that redox ratio increases with the increasing amount of alkaline-earth oxides in the glass. Principal component analysis of the set of studied spectra (in the range form 6700 cm⁻¹ to 18000 cm⁻¹) resulted in two to three independent spectral components. Deconvolution of the spectral bands centred at about 5000 cm⁻¹ and 10000 cm⁻¹ showed that Fe²⁺ ions in studied glasses are predominantly in octahedral coordination.


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