Ceramics-Silikáty 39, (1) 20 - 29 (1995) |
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INFRARED SPECTRA OF GLASSES IN THE 15 Na₂O.10 (MgO, CaO, TiO₂, ZrO₂).75 SiO₂ SYSTEM
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Liška Marek 1, Hulínová Hana 1, Šimurka Peter 1,
Antalík Jozef 2
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1 Institute of Inorganic Chemistry, Slovak Acaderny of Sciences,
Martina Rázusa 10, 911 01 Trenčín, Slovak Republic
2 Department of Phvsical Chemistry, Faculty of Chemical Technology, Slovak Technical University,
Radlinského 9, 812 37 Bratislava, Slovak Republic
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The shape of infrared spectra measured by KBr pellet technique is characterized by very strong asymmetric peak with maximum at 996-1072 cm⁻¹ medium peak at 774-786 cm⁻¹ and strong absorbance peak at 447-466 cm⁻¹. The maxima positions of the first and the third absorption peaks correlate linearly with the NBO/T ratio (i.e. non-bridging oxygen to tetrahedral central atom molar ratio), which depends on the presupposed value of the network-forming fraction of Ti atoms α₄(Ti). The correlation coefficient reaches maximal value for α₄(Ti)=0.15 for the first peak and for α₄(Ti)=0.25 for the third peak, confirming such way the partial network-forming activity of Ti0₂. The spectral shape is explained by the superposition of Q⁴(Si0₂; 3-dimensional), Q³(Si₂O₅; sheet) and Q²(SiO₃; chain) structural units. The spectra of Q⁴ and Q³ units obtained from measured spectra by linear regression analysis are in qualitative agreement with the results of numerical FG simulation of Furukawa et al.
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