Preparation of ammonium rare earth double oxalates and rare eart

Details Preparation of ammonium rare earth double oxalates and rare eart Preparation of ammonium rare earth double oxalates and rare eart

1995-05-08

1997-09-09

Bos, Steven

Chemistry of inorganic compounds

Rare earth compound

534 16, C01F 1700, C07F 500

Patent

active

056653239

ABSTRACT:
Particulate and coarse ammonium rare earth double oxalate crystals, readily converted into rare earth oxide particles by simple calcination, e.g., yttrium oxide particles, are prepared by (a) intimately admixing, in an aqueous medium, (i) at least one rare earth neutral oxalate with (ii) at least one precursor compound adapted to liberate ammonium ions in water and (iii) at least one precursor compound adapted to liberate oxalate ions in water, (b) separating the double oxalate precipitate thus formed, and (c), optionally, washing and drying such double oxalate precipitate.

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patent: 3635658 (1972-01-01), Ferri et al.
patent: 4238467 (1980-12-01), Dugan et al.
M.F. Barrett, et al, "Double Ammonium Oxalates of the Rare Earths and Yttrium," J. Inorg. Nucl. Chem., 1964, no month, vol. 26, pp. 931-936.
Gmelin Handbook of Inorganic Chemistry, 8th edition, 1984, no month, pp. 141-145.
Handbook of Chemistry and Physics, CRC Press, R.C. Weast, editor, 1972, pp. B-80 and B-153, no month.
Grant & Hackh's Chemical Dictionary, 5th edition, 1987, p. 496, no month.
Minagawa, et al, "New Preparative Method of Fine Powder of Yttrium (III) Oxide by Thermal Decompostion of NH.sub.4 Y(C.sub.2 O.sub.4).sub.2 .multidot. H.sub.2 O Fine Crystal," Bull. Chem. Soc. Jpn., 63(2), Feb., 1990, pp. 378-382.
Chemical Abstracts, vol. 113, No. 6, Aug. 6, 1990, Y. Minagawa et al, "New Preparation Method of fine powder of yttrium [III] oxide by thermal decomposition of NH4Y[C204]2.H20 fine crystal", p. 737.

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