Thermodynamics of the lanthanide trifluorides. IV. The heat capacities of gadolinium trifluoride GdF/sub 3/, lutetium trifluoride LuF/sub 3/, and yttrium trifluoride YF/sub 3/ from 5 to 350/sup 0/K
Journal Article
·
· J. Chem. Phys.; (United States)
OSTI ID:6557444
The heat capacities of three isostructural trifluorides GdF/sub 3/, LuF/sub 3/, and YF/sub 3/ were determined from 5 to 350/sup 0/K by adiabatic calorimetry. Below 15/sup 0/K GdF/sub 3/ contained an excess heat capacity contribution over the usual lattice heat capacity; LuF/sub 3/ and YF/sub 3/ showed no unusual heat capacities over the entire temperature range. Results in tabular form which list the heat capacity C/sup 0//sub p/, the entropy S/sup 0/, the enthalpy (H/sup 0/(T)-H/sup 0/(0)), and the Planck function -(G/sup 0/(T)-H/sup 0/(T))/T are given for the three trifluorides. Also presented are recommended thermochemical functions at 298.15/sup 0/K and tables of recommended high-temperature thermodynamic functions from 400/sup 0/K to the melting temperatures. The excess entropy associated with GdF/sub 3/ is discussed and values of the lattice heat capacity of GdF/sub 3/ below 15/sup 0/K are estimated.
- Research Organization:
- Argonne National Lab., IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6557444
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:5; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
DATA
ENTROPY
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
GADOLINIUM COMPOUNDS
GADOLINIUM FLUORIDES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LOW TEMPERATURE
LUTETIUM COMPOUNDS
LUTETIUM FLUORIDES
MEDIUM TEMPERATURE
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM FLUORIDES
360603* -- Materials-- Properties
DATA
ENTROPY
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
GADOLINIUM COMPOUNDS
GADOLINIUM FLUORIDES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LOW TEMPERATURE
LUTETIUM COMPOUNDS
LUTETIUM FLUORIDES
MEDIUM TEMPERATURE
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM FLUORIDES