Preparation of lanthanum chromite powders by sol-gel

Details Preparation of lanthanum chromite powders by sol-gel Preparation of lanthanum chromite powders by sol-gel

1991-06-14

1992-07-07

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501100, 501101, 501127, 501132, 501135, 501152, 252518, 252521, 423263, C04B 3552, C04B 3516, C04B 3550, C03C 300

Patent

active

051282844

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 .multidot.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 S.sub.1-x O.sub.4 .multidot.yH.sub.2 O having a huttonite structure is also disclosed.

REFERENCES:
patent: 3893821 (1975-07-01), Davies et al.
patent: 3922236 (1975-11-01), Dougins et al.
patent: 3974108 (1976-08-01), Staut et al.
patent: 4672046 (1987-06-01), Sawamura et al.
patent: 4687055 (1987-08-01), Hunold et al.
patent: 4699890 (1987-10-01), Matsui

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