Production of finely divided rare earth ammonium oxalates/finely

Details Production of finely divided rare earth ammonium oxalates/finely Production of finely divided rare earth ammonium oxalates/finely

1994-05-03

1996-05-21

Bos, Steven

Chemistry of inorganic compounds

Rare earth compound

534 16, C01F 1700, C07F 500

Patent

active

055187030

ABSTRACT:
Very finely divided ammonium rare earth double oxalates, readily converted into corresponding rare earth oxides by calcination, such oxides being well adopted, e.g., for the production of luminescent compounds therefrom, are prepared by (a) admixing a second solution of a rare earth compound, e.g., a salt, with a first solution containing oxalate and ammonium ions, (b) then separating the precipitate thus obtained from such mixed solution of reaction, and (c) optionally, drying the separated precipitate.

REFERENCES:
patent: 4375453 (1983-03-01), Nalewajek et al.
patent: 4891163 (1990-01-01), Tanaka et al.
M. F. Barrett, T. R. R. McDonald and N. E. Topp, "Double Ammonium Oxalates of the Rare Earths and Yttrium", J. Inorg. Nucl. Chem., 1964, vol. 26, pp. 931-936.
T. R. R. McDonald and Jennifer M. Spink, "The Crystal Structure of a Double Oxalate of Yttrium and Ammonium, NH.sub.4 y(C.sub.2 O.sub.4).sub.2,H.sub.2 O", Acta Cryst., 1967, vol. 23, pp. 944-949.
Yukinori Minagawa and Fumikazu Yajima, "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.2.H.sub.2 O Fine Crystal Obtained by Reaction of a Strongly Acidic Solution of Yttrium Oxalate and an Aqueous Ammonia Solution", Bull. Chemical Society of Japan, 1990, vol. 63, pp. 378-382.
Yukinori Minagawa and Fumikazu Yajima, "Preparative Method of Fine Powder of Yttrium (III) Oxide by Thermal Decomposition of NH.sub.4 Y(C.sub.2 O.sub.4).sub.2,H.sub.2 O Fine Crystals Obtained by New Reaction of Yttrium (III) Hydroxide Slurry with Acid Solution", Bull. Chemical Society of Japan, vol. 63, pp. 2115-2117, 1990.
Patent Abstracts of Japan, vol. 4, No. 61 (C-9) [543], 8 May, 1980 JP-A-55 28 905 (Mitsubishi Kasei Kogyo) 29-2-1980.

Affiliated with

Also associated with

Rating

Production of finely divided rare earth ammonium oxalates/finely does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Production of finely divided rare earth ammonium oxalates/finely, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of finely divided rare earth ammonium oxalates/finely will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2035863