Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1977-07-11
1978-09-19
McCarthy, Helen M.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 65, 264 65, 423263, 423266, C04B 3550
Patent
active
041151348
ABSTRACT:
An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttriabase body consisting essentially of yttria and from about 6 to 14 mole percent lanthana.
A method for preparing the transparent yttria doped with lanthana is also provided comprising admixing or co-precipitating lanthana or a precursor thereof with yttria or a precursor thereof, washing, drying and screening the mixture, calcining the admixed or co-precipitated powders, pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for from about 1/6 to 6 hours at a temperature above the H-phase transition and for from about 1/2 to 6 hours at a temperature below the H to C phase transition, said sintering being effected at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.
REFERENCES:
patent: 3180741 (1965-04-01), Wainer et al.
patent: 3640887 (1972-02-01), Anderson
Berndt, U. et al., "New A.sup.III B.sup.III O.sub.3 Interwanthanide Perovskite Compounds," J. of Solid State Chemistry 13, No. 1-2, Feb. 1975, pp. 131-135.
GTE Laboratories Incorporated
Keay David M.
McCarthy Helen M.
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