Copper cofire X7R dielectrics and multilayer capacitors based on zinc borate fluxed barium titanate ceramic

Tae Ho Song, Clive A. Randall

Research output: Contribution to journalArticle

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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.

Original languageEnglish (US)
Pages (from-to)39-46
Number of pages8
JournalJournal of Electroceramics
Issue number1
StatePublished - Mar 1 2003


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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