Morphologically improved rare earth trifluorides

Details Morphologically improved rare earth trifluorides Morphologically improved rare earth trifluorides

1989-06-30

1991-05-07

Lewis, Michael L.

Chemistry of inorganic compounds

Rare earth compound

423489, C01B 908, C01F 1700

Patent

active

050135341

ABSTRACT:
Morphologically improved, aggregated, monodispersed rare earth trifluoride particulates having a controlled and narrow grain size distribution, and a mean diameter of less than 1 .mu.m, are prepared by (i) reacting an aqueous solution of a rare earth salt with a solution of ammonium fluoride, (ii) separating the precipitate thus formed, and (iii) heat treating the separated precipitate.

REFERENCES:
patent: 2952514 (1960-09-01), Smith
patent: 3153570 (1964-10-01), Domning et al.
"Preparation and Paramagnetism of the Rare Earth Trifluorides", S. Kern and P. M. Raccah, Journal of Phys. Chemi. Solids, Pergamon Press, 1965, vol. 26, pp. 1625-1628.
Gmelin Handbuch Der Anorganishen Chemie, H. Bergmann, "Seltenerdelemente; Sc, Y, La und Lanthanide", Edition 8, System No. 39, Teil 3C, 1976, Springer Verlag, Berlin, pp. 3, 34, 35, 168, 169.
Spedding and Doane, "The Rare Earths", Wiley & Sons, N.Y., 1961, p. 84.
Perry, R. H. ed., "Perry's Chemical Engineers' Handbook", McGraw-Hill, N.Y., 1984, pp. 8-14-8-15 and 8-48.

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