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Barium/Lead‐Rich High Permittivity Glass–Ceramics for Capacitor Applications
Author(s) -
Rangarajan Badri,
Jones Beth,
Shrout Tom,
Lanagan Michael
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01470.x
Subject(s) - materials science , crystallization , dielectric , electrical resistivity and conductivity , ceramic , microstructure , barium titanate , mineralogy , permittivity , barium , ceramic capacitor , diffractometer , perovskite (structure) , composite material , analytical chemistry (journal) , capacitor , metallurgy , chemical engineering , optoelectronics , scanning electron microscope , chemistry , physics , electrical engineering , chromatography , quantum mechanics , voltage , engineering
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 10 13 Ω·cm at 150°C. MnO 2 additions were made to improve the electrical resistivity of glass–ceramics.