Anomalous Permittivity during Crystallization of BaTi₂O₅ Glass

A 2 mm-diameter glass sphere of ferroelectric BaTi₂O₅ was produced from melt using containerless processing. Three successive phase transitions above the glass transition temperature, T _{g − end} = 972 K, of BaTi₂O₅ were observed. At crystallization temperature, T _α−onset = 994 K, the permittivity at 100 Hz jumped instantaneously by more than one order of magnitude, peaking at over 10⁷. The interesting behavior at crystallization temperature has important technical implications for obtaining an excellent dielectric ceramics-glass through controlled crystallization of BaTi₂O₅ glass.

Keywords:

• Oxide glass
• crystallization
• dielectric properties

Acknowledgments

Paper originally presented at IMF-11, Iguassu Falls, Brazil, September 5–9, 2005.