Colloidal dispersion of particles of a rare-earth vanadate or phosphovanadate
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United States of America Patent
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Mar 9, 2010
Grant Date -
Sep 13, 2007
app pub date -
May 11, 2007
filing date -
Sep 12, 2001
priority date (Note) -
Expired
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Abstract
The invention concerns a colloidal dispersion of a vanadate or a phosphovanadate of at least a rare earth comprising either a complex-forming agent having a pK higher than 2.5, or an anion of a monovalent acid, soluble in water and having a pKa ranging between 2.5 and 5. The dispersion is obtained by contacting a colloidal dispersion or a dispersion of initial complexes comprising at least a rare earth compound and at least a complex-forming agent or an anion of said monovalent acid and whereof the pH has been adjusted to a value of at least 7, with vanadate ions, then, in adjusting the pH of the resulting medium to a value of at least 9 and heating.
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