Microwave dielectric ceramic composition

Details Microwave dielectric ceramic composition Microwave dielectric ceramic composition

1994-12-23

1996-02-06

Group, Karl

Compositions: ceramic

Ceramic compositions

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

C04B 35495, C04B 35497

Patent

active

054895596

ABSTRACT:
The present invention provides a microwave dielectric ceramic composition in which .epsilon.r, Qu and .tau.f are generally controlled within a practical characteristic range and each of the characteristics is maintained in a well balanced state. A ceramic composition of the present invention comprises a composition represented by xBi.sub.2 O.sub.3 -(1-x) (yNb.sub.2 O.sub.5 -(1-y)Ta.sub.2 O.sub.5) in which 0.45.ltoreq.x.ltoreq.0.55 and 0.1.ltoreq.y<1.0 as a main ingredient, to which not more than 0.8 parts by weight of V.sub.2 O.sub.5 is added and incorporated. An another ceramic composition comprises a composition represented by Bi(NbxTa1-x)O.sub.4 in which 0<x.ltoreq.0.96 as a main ingredient, to which not more than 5 wt % of V.sub.2 O.sub.5 and not more than 2 wt % of PbO are added and incorporated. An another ceramic composition comprises the main ingredient as described above to which not more than 5 wt % of V.sub.2 O.sub.5 and not more than 2 wt % of MnO.sub.2 are added and incorporated. An another ceramic composition comprises the main ingredient as described above to which not more than 2 wt % of V.sub.2 O.sub.5 and not more than 1 wt % of TiO.sub.2 are added and incorporated. An another ceramic composition comprises the main ingredient as described above, to which not more than 2 wt % of V.sub.2 O.sub.5, not more than 2 wt % of MnO.sub.2 and not more than 0.7 wt % of TiO.sub.2 are added and incorporated. Instead of TiO.sub.2 described above, not more than 0.5 wt % (particularly not more than 0.4 wt %) of PbO can be added and incorporated.

REFERENCES:
patent: 3997457 (1976-12-01), Takahashi et al.
patent: 4900702 (1990-02-01), Tsuboi et al.
patent: 5004713 (1991-04-01), Bardhaa et al.
patent: 5350639 (1994-09-01), Inoue et al.

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