Reduced alkaline earth metal powders and process for producing s

Details Reduced alkaline earth metal powders and process for producing s Reduced alkaline earth metal powders and process for producing s

1980-07-23

1981-08-18

Cooper, Jack

Compositions

Barrier layer device compositions

Group vi element-containing

106 733, 252520, 252521, C04B 3546, H01B 106

Patent

active

042845211

ABSTRACT:
An improved polycrystalline semiconducting ceramic composition can be produced from a novel powder which comprises a reduced alkaline earth metal titanate doped with a hexavalent metal oxide such as (MO.sub.3) (Bi.sub.2 O.sub.3).sub.x where M is tungsten or molybdenum, and x ranges from 0 to 7. This powder, which has a mean particle size on the order of less than 10 microns, may be liquid phase sintered with lead germanate to produce a ceramic composition having an extremely fine grain size. By reducing the earth metal titanate (either chemically or gaseously) prior to the liquid phase sintering with lead germanate, particle or grain size growth is substantially eliminated, and the grain size of the ceramic composition is similar to the original particle size of the earth metal titanate.

REFERENCES:
patent: 3933668 (1976-01-01), Takahashi et al.
patent: 4014822 (1977-03-01), Fujikawa
patent: 4022716 (1977-05-01), Ueoka et al.
patent: 4096098 (1978-06-01), Umeya et al.
patent: 4143207 (1979-03-01), Itakura et al.

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