Rare earth fluoride solubilities, complex formation and thermodynamic functions for the solution process

Conference · Wed Jan 01 04:00:00 UTC 1986

OSTI ID:5698144

Menon, M P; James, J; Jackson, J D

The solubilities, solubility products and thermodynamic functions for four rare earth fluoride-water systems, LaF/sub 3/(s)-H/sub 2/O(1), NdF/sub 3/(s)-H/sub 2/O(1), SmF/sub 3/(s)-H/sub 2/O(1) and GdF/sub 3/(s)-H/sub 2/O(1), have been measured using conductometric and potentiometric techniques. Radiometric procedure was also employed for the measurement of solubilities of LaF/sub 3/ and NdF/sub 3/. Among the rare earth fluorides studied so far, gadolinium trifluoride was found to have the highest solubility, differing from the solubilities of other fluorides by a factor of ten. There is also considerable difference in the values for thermodynamic functions for the dissolution of GdF/sub 3/ from those of other fluorides. There is evidence for the existence of the monofluoride and difluoride complexes of the lanthanons studied in this work. The stability constants for the monfluoride complexes range from 427 for LaF/sup +2/ to 1215 for GdF/sup +2/ while those for the difluoride complexes are of the order of 10/sup 4/. 18 refs., 2 figs., 3 tabs.

• Research Organization: Savannah State Coll., GA (USA). Dept. of Chemistry
• DOE Contract Number: FG09-84SR14014
• OSTI ID: 5698144
• Report Number(s): CONF-860602-2; ON: DE86011342
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
AQUEOUS SOLUTIONS
DATA
DISPERSIONS
ENERGY
ENTHALPY
ENTROPY
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
FREE ENTHALPY
GADOLINIUM COMPOUNDS
GADOLINIUM FLUORIDES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM FLUORIDES
MIXTURES
NEODYMIUM COMPOUNDS
NEODYMIUM FLUORIDES
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SAMARIUM FLUORIDES
SOLUBILITY
SOLUTIONS
STABILITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES