Stable colloidal dispersions of rare earth compounds

摘要

Stable colloidal dispersions, in water, of rare earth compounds, e.g., yttric rare earth compounds, are produced by (a) reacting, in an aqueous reaction medium, a rare earth oxide with a controlled effective amount of a monovalent water-soluble acid having a pKa of from 2.5 to 5.0, and then (b) heating the resulting medium of reaction.