Abstract
Copper cofired dielectrics may give new opportunities for high temperature capacitors. To demonstrate feasibility, BaTiO3 has been formulated into X7R dielectrics with copper inner electrodes. This requires the development of a formulation that permits sintering at temperatures below 1000°C, and then firing in a reducing environment in atmospheres pO2 ∼ 10−8 atms. ZnO—B2O3 chemistries were explored with additional dopants to modify densification and the temperature coefficient of capacitance of the BaTiO3 dielectric anomaly. X7R characteristics with relative dielectric permittivities ∼2750 and tanδ ∼ 0.01 at 1 kHz were obtained at room temperature. Multilayer capacitors were fabricated in 3.2 mm × 1.6 mm size multilayers with an acrylic binder system and oxidation resistive copper inner electrodes.
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Song, TH., Randall, C.A. Copper Cofire X7R Dielectrics and Multilayer Capacitors Based on Zinc Borate Fluxed Barium Titanate Ceramic. Journal of Electroceramics 10, 39–46 (2003). https://doi.org/10.1023/A:1024028024779
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DOI: https://doi.org/10.1023/A:1024028024779