Dielectric material, a method for producing the same and a diele

Details Dielectric material, a method for producing the same and a diele Dielectric material, a method for producing the same and a diele

1997-10-24

2000-09-12

Group, Karl

Compositions: ceramic

Ceramic compositions

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

501137, C04B 35495

Patent

active

061178063

ABSTRACT:
Dielectric materials are disclosed that are based on BaO--ZnO--Ta.sub.2 O.sub.5 represented by the formula Ba(Zn.sub.1/3 Ta.sub.2/3)O.sub.3. Ba has been partly replaced by K and either Zn or Ta has been replaced by at least one element selected from Mg, Zr, Ga, Ni, Nb, Sn. The dielectric materials have a relatively high permittivity, a small absolute value of the temperature coefficient of resonance frequency, and a high unloaded quality factor. A method for producing the dielectric materials is also disclosed which includes mixing given amounts of starting materials, such as, for example, BaCO.sub.3, ZnO, Ta.sub.2 O.sub.5, K.sub.2 CO.sub.3, MgCO.sub.3, SnO.sub.2 or ZrO.sub.2, compacting the mixture to produce a compact, sintering the compact in an oxidizing atmosphere such as, for example, air, at 1,400 and 1,600.degree. C., more preferably at 1,550 to 1,600.degree. C. for 2 hours, and then heating the sintered compact at a temperature lower than the sintering temperature by from 50 to 250.degree. C., e.g., by 100.degree. C., for at least 12 hours, preferably for 24 hours. A dielectric resonator comprising the dielectric material of the present invention is also disclosed.

REFERENCES:
patent: 4485180 (1984-11-01), Konoike et al.
patent: 4487842 (1984-12-01), Nomura et al.
patent: 4585744 (1986-04-01), Konoike et al.
patent: 4717694 (1988-01-01), Tamura et al.
patent: 4731207 (1988-03-01), Matsumoto et al.
patent: 4853199 (1989-08-01), Inoue et al.
patent: 4968649 (1990-11-01), Tsurumi et al.
patent: 4973567 (1990-11-01), Matsumoto et al.
patent: 5039637 (1991-08-01), Htuga et al.
patent: 5136270 (1992-08-01), Hatanaka et al.
patent: 5246898 (1993-09-01), Fujimaru et al.
patent: 5457076 (1995-10-01), Katagiri et al.
patent: 5721182 (1998-02-01), Reichert et al.
patent: 5733831 (1998-03-01), Takada et al.
E. Kim et al., "Effect of Nickel on Microwave Dielectric Properties of Ba(Mg.sub.1/3 Ta.sub.2/3)O.sub.3 ", Journal of Materials Science, vol. 29, No. 3, Feb. 1994, pp. 830-834.
K. Tochi, "Improvement of Sinterability of Ba(Mg.sub.1/3 Ta.sub.2/3)O.sub.3 -Powder Compacts by BaTa.sub.2 O.sub.6 Additions", Journal of the Ceramic Society of Japan, International Edition, vol. 100, No. 12, Dec. 1992, pp. 1441-1443.
C. Lee et al., "Effect of La/K A-site Substitutions on the Ordering of Ba(Zn.sub.1/3 Ta.sub.2/3)O.sub.3 ", Journal of American Ceramic Society, vol. 80, No. 11, Nov. 1997, pp. 2885-2890.
Derwent Abstract of JP 05 148 005 A, Jun. 1993.

Affiliated with

Also associated with

Rating

Dielectric material, a method for producing the same and a diele does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dielectric material, a method for producing the same and a diele, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dielectric material, a method for producing the same and a diele will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-95872