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New ceramic dielectrics for multilayer capacitors

: Schönecker, A.; Gesemann, H.J.

Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel:
PTM '93. Materials by Powder Technology. Proceedings
Oberursel: DGM-Informationsgesellschaft, 1993
ISBN: 3-88355-191-0
International Conference on Materials by Powder Technology <1993, Dresden>
Fraunhofer IKTS ()
core-shell microstructure; dielectric; multilayer capacitor; X7

Temperature stability of type II dielectrics can be improved by using and tailoring multiphase materials with core- shell microstructure. Using a mixture of Bi-layer-structure oxide and Pb-perovskites as shell forming phase a dielectric with X7D classification was obtained, showing permittivity 1550 at 1 kHz, loss 1 percent, relative C-variation within plus/minus 2,5 percent. The sintering temperature is 1120 centigrade. Advanced dielectric materials based on core-shell microstructure allow the fabrication of ceramic multilayer capacitors with stability in the intermediate range of COG and X7R and drastically reduced size compared to the COG type.