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

Ceramics-Silikáty 39, (1) 20 - 29 (1995)


INFRARED SPECTRA OF GLASSES IN THE 15 Na₂O.10 (MgO, CaO, TiO₂, ZrO₂).75 SiO₂ SYSTEM
 
Liška Marek 1, Hulínová Hana 1, Šimurka Peter 1, Antalík Jozef 2
 
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

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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