Ceramics-Silikáty 52 (2) 77-84 (2008)

THE EFFECT OF CRYSTALLIZATION ON THE BASICITY IN THE SYSTEM Li₂O–2SiO₂

C. Căpăţînă, C. M. Simonescu

The paper presents the study of the crystallization influence on the basicity in the Li₂O–2SiO₂ glass. The quantitative methods were used for the basicity determination of the oxide glasses. The Li₂O–2SiO₂ samples were thermally treated at 560°C, for 20, 30, 55, 95 minutes in presence and in absence of Cu²⁺ as indicator. The experimental results showed that when the crystallinity degree increases, the wavenumber of the Cu²⁺ absorption decreases corresponding to a higher basicity of samples. It was observed an increasing of the maximum diameter of crystallites and a decreasing of the crystallization speed with the extension of the thermal treatment time at 560°C.

Keywords: pB basicity percentage, Crystallization, Cu(II), Crystallites