Spectrophotometric studies of holmium(III) chloride-aluminum(III) chloride vapor complexes

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:6870398

Williams, C W; Hessler, J P; Peterson, E J

The gas complexation reactions between LnCl/sub 3/ and Al/sub 2/Cl/sub 6/ to yield molecular species of the form LnCl/sub 3/ (Al/sub 2/Cl/sub 6/)/sub x/ have been studied for a number of years. The spectrophotometric technique has been used to deduce the thermodynamic properties of the molecular species. We have studied the HoCl/sub 3/ (Al/sub 2/Cl/sub 6/)/sub x/ system from 600 to 900/sup 0/K and at Al/sub 2/Cl/sub 6/ pressures between 1 and 7 atm. The Ho/sup 3 +/ hypersensitive transition between /sup 5/I/sub 8/ and /sup 5/G/sub 6/ at 456 nm has been used to measure the complex vapor densities as a function of pressure and temperature. A temperature-dependence of the optical absorption spectrum was observed in samples with a constant Ho/sup 3 +/ ion density. These data cannot be understood in terms of the generally used treatment of molar absorptivity, but requires the introduction of an effective oscillator strength. A temperature-dependent oscillator effect is also observed and this is interpeted as evidence for the presence of multiple species with differing oscillator strengths. The consequence of these observations for the determination of equilibrium constants for the different species will be discussed.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6870398
• Report Number(s): CONF-8004148-1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM CHLORIDES
ALUMINIUM COMPLEXES
ALUMINIUM COMPOUNDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
DENSITY
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
HOLMIUM CHLORIDES
HOLMIUM COMPLEXES
HOLMIUM COMPOUNDS
KINETICS
MEDIUM PRESSURE
PHYSICAL PROPERTIES
RARE EARTH COMPLEXES
RARE EARTH COMPOUNDS
REACTION KINETICS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
VAPORS