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

1995-04-24

1997-09-02

Bos, Steven

Chemistry of inorganic compounds

Rare earth compound

534 16, C01F 1700, C07F 500

Patent

active

056628749

ABSTRACT:
Particulate ammonium rare earth double oxalate crystals, homogeneous in particle size and having a narrow particle size distribution and 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 precursor compound adapted to liberate oxalate ions in aqueous solution with (ii) at least one water-soluble rare earth compound and (iii) at least one ammonium salt, (b) separating the double oxalate precipitate thus formed, and (c), optionally, washing and drying such double oxalate precipitate.

REFERENCES:
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patent: 4238467 (1980-12-01), Dugan et al.
patent: 4375453 (1983-03-01), Nalewajek et al.
Bull.Chem.Soc.Jpn., 63, 378-382, vol. 63, No. 2 New Preparative Method of Fine Powder of Yttrium (III) Oxide by Thermal Decomposition of NH.sub.4 Y(C.sub.2 O.sub.4).sub.4,H.sub.2 O Fine Crystal Obtained by Reaction of a Strongly Acidic Solution of Yttrium Oxalate and an Aqueous Ammonia Solution, by Yukinori Minagawa and Fmikazu Yajima (1990).
Bull.Chem.Soc.Jpn., 63, 2115-2117 (1990) New Preparative Method of Fine Powder of Yttrium (III) Oxide by Thermal Decomposition of NH.sub.4 Y(C.sub.2 O.sub.4).sub.4,H.sub.2 O Fine Crystal Obtained by Reaction by Yttrium (III) Hydroxide Slurry with Oxalic Acid Solution, by Yukinori Minagawa and Fmikazu Yajima.
Acta Cryst. (1967). 23,944 The Crystal Structure of a Double Oxalate of Yttrium and Ammonium, NH.sub.4 Y (C.sub.2 O.sub.4).sub.4,H.sub.2 O, by T.R.R. McDonald and Jennifer M. Spink.
M.F. Barrett, et al., "Double Ammonium Oxalates of the Rare Earths and Yttrium," J. Inorg. Nucl. Chem., vol. 26, pp.931-936, 1964.
Patent Abstracts of Japan, vol. 10, No. 4, Jan. 9, 1986, & JP-A-60 166222 (Mitsubishi Kinzoku) Aug. 29, 1985.
"Gmelin Handbook of Inorganic Chemistry System", No. 39, Part D5, 1984 , Springer Verlag, Berlin RFA, p. 141.

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