Dielectric ceramic compositions

Details Dielectric ceramic compositions Dielectric ceramic compositions

1994-12-29

1996-04-30

Jones, Deborah

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501139, C04B 3546

Patent

active

055125247

ABSTRACT:
The present invention is directed to a ceramic composition comprising at least three of the four phases BaTi.sub.4 O.sub.9, Ba.sub.2 Ti.sub.9, BaZn.sub.2 Ti.sub.4 O.sub.11 and Ba.sub.3 Nb.sub.4 Ti.sub.4 O.sub.21 (i.e., the phases BT.sub.4 ss, BZ.sub.2 T.sub.9 ss BZ.sub.2 T.sub.4 and BNbT). The ceramic composition may further comprise the phase Ba.sub.3 Ta.sub.4 Ti.sub.4 O.sub.21 (BTaT). The ceramic compositions have an excellent combination of electrical characteristics including Q value at the frequencies of interest for dielectric resonators, the dielectric constant and the T.sub.f value and are well adapted for use as electrical components in equipment operating at microwave frequencies such cellular communications equipment.

REFERENCES:
patent: Re29484 (1977-11-01), Utsumi et al.
patent: 3938064 (1976-02-01), O'Bryan, Jr. et al.
patent: 4330631 (1982-05-01), Kawashima et al.
patent: 4337446 (1982-06-01), O'Bryan, Jr. et al.
patent: 4563661 (1986-01-01), O'Bryan, Jr. et al.
patent: 5262370 (1993-11-01), Negas et al.

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