Dielectric ceramic for microwaves

Details Dielectric ceramic for microwaves Dielectric ceramic for microwaves

1994-04-28

1994-12-27

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

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

501136, 501137, 501138, C04B 3546

Patent

active

053766032

ABSTRACT:
In a dielectric ceramic composed of a La.sub.2 O.sub.3 -CaO-TiO.sub.2 -MgO type or a BaO-Nd.sub.2 O.sub.3 -TiO.sub.2 type, the oxygen vacancy concentration of the ceramic is controlled below 7.times.10.sup.18 /cm.sup.3 by, for example, annealing the mixture after firing, or heat-treating the mixture after firing. The Q value of the dielectric ceramic can be markedly increased. In addition, ceramics having stable properties can be produced. Thus, the dielectric ceramics can fully cope with high frequencies and large electrification.

REFERENCES:
patent: 3732117 (1973-05-01), Nitta et al.
patent: 4106075 (1978-08-01), Baumann et al.
patent: 4115493 (1978-09-01), Sakabe et al.
patent: 4248727 (1981-02-01), Kawashima et al.
patent: 4670409 (1987-06-01), Okawa et al.
patent: 4699891 (1987-10-01), Sato et al.
patent: 4755493 (1988-07-01), Takeuchi et al.
"Microwave Characteristics of (Zr,Sn)TiO.sub.4 and BaO--PbO--Nd.sub.2 O.sub.3 --TiO.sub.2 Dielectric Resonators"; Wakino et al.; Journal of American Ceramic Society; vol. 67, No. 4, Jun., 1983.
"Ba(Zn.sub.1/3 Ta.sub.2/3)O.sub.3 Ceramics with Low Dielectric Loss at Microwave Frequencies"; Kawashima et al.; Journal of American Ceramic Society; vol. 66, No. 6, Apr., 1984.

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