Glass formation in the systhem CaO—TiO₂—B₂O₃

Abstract

The feature of glass formation in the CaO—TiO₂—B₂O₃ system in the region that corresponds to the following (% (wt.)) 20—60СаО, 20—60TiO₂—40—80B₂O₃ was studied. It is promising for the development of new glassy matrices for the immobilization of radionuclides, which are part of liquid radioactive waste, namely salt boron-containing fusions of nuclear power plants. The crystallization ability, phase composition and resistance to leaching of glass samples were studied too. It was shown that the addition of extra oxides of ZrO₂ and SiO₂ in the amount of 10% increases resistance to leaching in both neutral and alkaline environments. Moreover, the results of differential-thermal analysis, dilatometric analysis of glass samples and their microhardness were presented. According to the obtained results, an optimal glass composition was proposed that corresponds to the oxides content (% (wt.)): 10B₂O₃— 30СаО—10 TiO₂ —10 ZrO₂ —10SiO₂