Application of High Permittivity Bismuth Copper Titanate in Multilayer Capacitors

• Authors: D. Szwagierczak , J. Kulawik
• Languages of publication: EN

Abstracts

EN

A nonferroelectric high permittivity compound with the perovskite structure, Bi_{2/3}Cu_3Ti_4O_{12}, was synthesized at 900°C. The ceramic powder and appropriate organic additives were used for preparation of a slurry for tape casting. The obtained green tapes were smooth, flexible, and with a uniform thickness of 25 μm after drying at 50°C. Ag electrodes were screen printed on green rectangular sheets cut by a laser. Subsequent operations were screen printing of Ag internal electrodes, stacking of green sheets, isostatic lamination, cutting, deposition of external terminations and co-firing of dielectric and conductive layers at 850°C. Scanning electron microscopy observations showed well sintered, dense, fine-grained microstructure of ceramic layers and good cooperation with the electrodes made of commercial Ag paste. Capacitance and dissipation factor of multilayer capacitors were examined in the temperature range from - 55 to 330C at frequencies 10 Hz-2 MHz. The fabricated multilayer capacitors exhibit high capacitance and relatively low temperature coefficient of capacitance in the temperature range from - 55 to 110°C. The obtained lead-free high permittivity nonferroelectric material Bi_{2/3}Cu_3Ti_4O_{12} is a spontaneously formed internal barrier capacitor. This material seems to be a promising alternative for conventional lead-based relaxor dielectrics in multilayer ceramic capacitors.

Keywords

EN

77.22.-d; 81.20.-n; 84.32.Tt; 85.40.Xx

Discipline

• 81.20.-n: Methods of materials synthesis and materials processing(see also 61.72.U- Doping and impurity implantation; for crystal growth, see 81.10.-h; for film growth, deposition and epitaxy, see 81.15.-z)
• 77.22.-d: Dielectric properties of solids and liquids(for dielectric properties of tissues and organs, see 87.19.rf)
• 85.40.Xx: Hybrid microelectronics; thick films
• 84.32.Tt: Capacitors(for electrochemical capacitors and supercapacitors, see 82.47.Uv)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 1
• Pages: 119-121

Dates

published

2012-01

Contributors

author

D. Szwagierczak

• Institute of Electron Technology, Kraków Division, Zabłocie 39, 30-701 Kraków, Poland

author

J. Kulawik

• Institute of Electron Technology, Kraków Division, Zabłocie 39, 30-701 Kraków, Poland

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Identifiers

DOI

10.12693/APhysPolA.121.119