Compositions – Electrically conductive or emissive compositions – Metal compound containing
Patent
1990-04-25
1991-10-29
Morris, Theodore
Compositions
Electrically conductive or emissive compositions
Metal compound containing
423263, 501152, H01B 106
Patent
active
050614029
ABSTRACT:
This invention relates to a process for the preparation of a crystalline compound having an empirical formula LaCr.sub.x A.sub.1-x O.sub.4.yH.sub.2 O where A is a metal selected from the group consisting of Mg, Sr, Ca and Ba, x ranges from 0.99 to about 0.7 and y ranges from 0 to 0.15. The process comprises adding a solution of the appropriate metal salts to a solution of ammonium hydroxide thereby precipitating a hydroxide gel intermediate, which is dried and calcined in air to yield the resultant crystalline compound which has a huttonite structure. Additionally, this invention relates to a process for the preparation of a ceramic powder having the empirical formula LaCr.sub.x A.sub.1-x O.sub.3, where A is a metal selected from the group consisting of Mg, Sr, Ca and Ba, and x ranges from 0.99 to about 0.7. Finally, a ceramic composition having the empirical formula LaCr.sub.x A.sub.1-x O.sub.4.yH.sub.2 O having a huttonite structure is also disclosed.
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Vasileha et al., "X-Ray Investigations of Polycrystalline Lanthanum Chromate (V) and Strontium Chromate (VI)" Dapor. Akad. Nauk Ukr. RSP, Ser. B: Geol; Khim. Biol. Nauki, 1977 (5), 410-413.
Li Beili
Olson William L.
Yamanis Jean
Allied-Signal Inc.
Molinaro Frank S.
Morris Theodore
Ryther Mary Jo
Squillante Edward
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