Glasses and glass-ceramics in the SrO–TiO2–Al2O3–SiO2–B2O3 system and the effect of P2O5 additions
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The glass formation abilities of various compositions in SrO–TiO2–Al2O3–SiO2, SrO–TiO2–B2O3–SiO2, SrO–TiO2–Al2O3–B2O3, and SrO–TiO2–Al2O3–SiO2–B2O3 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 P2O5 on the glass structure and crystallization behavior was also studied. P2O5 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–TiO2–Al2O3–SiO2 glasses showed a lower tendency to crystallize and form glass-ceramics under the same conditions.
KeywordsTiO2 Differential Thermal Analysis P2O5 B2O3 Strontium Titanate
Bengisu expresses his thanks to Dr. S. Reis from the Graduate Center for Materials Research at the University of Missouri-Rolla for his helpful comments, to Prof. C. Isci from Yasar University for his help with density measurements, and to Prof. S. Karadeniz from 9 Eylul University, Department of Mechanical Engineering, for his help with hardness measurements.
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