Glasses and glass-ceramics in the SrO-TiO2-Al2O 3-SiO2-B2O3 system and the effect of P2O5 additions

Abstract

The glass formation abilities of various compositions in SrO-TiO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-SiO<inf>2</inf> SrO-TiO <inf>2</inf>-B<inf>2</inf>O<inf>3</inf>-SiO<inf>2</inf> SrO-TiO <inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-B<inf>2</inf>O<inf>3</inf> and SrO-TiO<inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-SiO<inf>2</inf>-B <inf>2</inf>O<inf>3</inf> systems were studied. Many new compositions were found to be suitable for the casting of crack-free optically clear glasses of different color and with glass transition temperatures ranging from 595 to 775 °C. The crystallization behavior structure and thermal expansion behavior of selected glasses were analyzed by DTA XRD dilatometry and heat treatment. The effect of P<inf>2</inf>O<inf>5</inf> on the glass structure and crystallization behavior was also studied. P<inf>2</inf>O<inf>5</inf> played a dual role depending on composition. In some glasses it acted as a nucleating agent while in others it suppressed crystallization. Heat treatment of borate and borosilicate glasses transformed them into glass-ceramics while comparable SrO-TiO<inf>2</inf>-Al<inf>2</inf>O<inf>3</inf>-SiO<inf>2</inf> glasses showed a lower tendency to crystallize and form glass-ceramics under the same conditions. © 2008 Springer Science+Business Media LLC. © 2025 Elsevier B.V. All rights reserved.