Dielectric properties of glass-ceramics containing barium/lead-based sodium niobates and barium titanate-based silicates were evaluated for capacitor applications. The glasses were formed by melt-rolling the respective constituents which were then crystallized by reheating them at higher temperatures. Crystallization schedules were formulated based on differential thermal analysis results. X-ray diffractometer patterns indicated that the samples were highly crystallized. Microstructure and microchemistry of samples were studied by transmission electron micropscopy. Perovskite, tungsten-bronze and fresnoite phases developed during crystallization have a strong effect on the resulted dielectric properties with permittivities ranging from 20 to 700. Resistivity measurements were done to study conduction mechanisms in samples and the resistivity values for glass-ceramics were found to be between 10 11 and 1013 Ω · cm at 150°C. MnO 2 additions were made to improve the electrical resistivity of glass-ceramics.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry