Dielectric material and process for producing the same

Details Dielectric material and process for producing the same Dielectric material and process for producing the same

1998-04-24

2000-12-26

Group, Karl

Compositions: ceramic

Ceramic compositions

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

264614, 3332191, C04B 35468

Patent

active

061659274

ABSTRACT:
A dielectric material based on BaO-RE.sub.2 O.sub.3 -TiO.sub.2 is disclosed, which has a relatively high relative permittivity .epsilon..sub.r, a small absolute value of the temperature coefficient of resonance frequency .tau..sub.f and a high coefficient of unloaded quality Q.sub.u. Processes for producing the dielectric material are also disclosed. The dielectric material comprises 100 parts by weight of main ingredients having a composition represented by xBaO-yRE.sub.2 O.sub.3 -zTiO.sub.2 (wherein RE represents a rare earth element and x+y+z=100) and up to 5 parts by weight of at least one alkali metal oxide. This alkali metal oxide serves to improve .epsilon..sub.r and Q.sub.u without a considerable sacrifice of .tau..sub.f. The RE preferably consists of samarium or a combination of samarium with neodymium and/or lanthanum. In producing the dielectric material, a dense sintered body can be obtained without fail by using a raw material containing hydroxyl groups as a starting material for the rare-earth ingredient among the main ingredients.

REFERENCES:
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patent: 5310710 (1994-05-01), Takase et al.
patent: 5554571 (1996-09-01), Okabe et al.
patent: 5750452 (1998-05-01), Park et al.
patent: 5827792 (1998-10-01), Fukuda et al.
Y. Inaguma et al, Solid State Ionics, vol. 70/71, 1994, pp. 196-202.

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