Glass–ceramic materials with regulated dielectric properties based on the system BaO–PbO–TiO2–B2O3–Al2O3

Vitrification and crystallization properties of glasses of the system BaO–TiO2–PbO–Al2O3 (B2O3) were investigated. The fields of vitrification based on ternary diagrams of BaTiO3–PbTiO3–(TiO2+Al2O3+B2O3) with varied contents of Al2O3 (10, 13, 16 mol.%) and B2O3 (3, 15 mol.%) were identified. The glass compositions obtained had relatively low melting temperature (≈1450 °C). These stable glasses could be thermally treated to produce glass-ceramics characterized by fine-crystalline structures and regulated permittivity associated to the contents of ferroelectric phases. The phase composition of such glass-ceramics included different PbxBa1-xTiO3 solid solutions depending on the starting chemical composition. Permittivity of the obtained materials (f=800 kHz, T=25 °C) varied from 20 to 680 relatively to the time of crystallization.