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

Tae Ho Song; Clive A. Randall

doi:10.1023/A:1024028024779

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 journal › Article › peer-review

39 Scopus citations

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.

Original language	English (US)
Pages (from-to)	39-46
Number of pages	8
Journal	Journal of Electroceramics
Volume	10
Issue number	1
DOIs	https://doi.org/10.1023/A:1024028024779
State	Published - Mar 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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title = "Copper cofire X7R dielectrics and multilayer capacitors based on zinc borate fluxed barium titanate ceramic",

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.",

author = "Song, {Tae Ho} and Randall, {Clive A.}",

note = "Funding Information: We wish to thank the members of the National Science Foundation I/UCRC Center for Dielectric Studies for their financial support and advice. This work was also partially supported by the Post-doctoral Fellowship Program of Korea Science & Engineering Foundation (KOSEF).",

year = "2003",

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language = "English (US)",

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T1 - Copper cofire X7R dielectrics and multilayer capacitors based on zinc borate fluxed barium titanate ceramic

AU - Song, Tae Ho

AU - Randall, Clive A.

N1 - Funding Information: We wish to thank the members of the National Science Foundation I/UCRC Center for Dielectric Studies for their financial support and advice. This work was also partially supported by the Post-doctoral Fellowship Program of Korea Science & Engineering Foundation (KOSEF).

PY - 2003/3

Y1 - 2003/3

N2 - 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.

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

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