The effect of TiO 2 on the structure and devitrification behavior of potassium titanium germanate glass

Abstract

The effect of replacing 20 mol% of GeO 2 by TiO 2 on the properties of potassium germanate glass was investigated. The structure and devitrification behaviour of glasses were studied by Fourier transform infrared spectroscopy (FTIR), differential thermal analysis (DTA) and X-ray diffraction (XRD). It was observed that potassium titanium germanate has a higher glass transition temperature and a higher thermal stability vs. crystallization. The presence of two exothermic peaks on the DTA curve of potassium germanate glass indicates the complex crystallization process. The XRD pattern of this glass heated at the temperature of the first crystallization peak indicated that the GeO 2 and K 2 Ge 7 O 15 were formed. Only the K 2 TiGe 3 O 9 phase was identified, in a case when potassium titanium germanate glass was heated at the temperature of the crystallization peak.