Thermodynamics of the lanthanide trifluorides. V. The heat capacities of dysprosium trifluoride, DyF/sub 3/, and erbium trifluoride, ErF/sub 3/, from 5 to 350 K

Journal Article · Sun Jan 01 04:00:00 EST 1984 · J. Chem. Phys.; (United States)

OSTI ID:5558727

Flotow, H E; O'Hare, P A.G.

The heat capacities of pure, well-characterized samples of DyF/sub 3/ and ErF/sub 3/ were measured by adiabatic calorimetry from 5 to 350 K. The heat capacities C/sup circle-open//sub p/, the entropies S/sup 0/, the enthalpy increments H/sup 0/(T)-H/sup 0/(0), and the Planck functions -(G/sup 0/(T)-H/sup 0/(0))/T are presented in tabular form at selected temperatures to 350 K. The values of the last three functions were adjusted for the removal of degeneracies associated with the magnetic ordering of DyF/sub 3/ and ErF/sub 3/ below 5 K. Also presented are recommended thermochemical functions at 298.15 K and tables of recommended high-temperature thermodynamic functions from 400 K to the melting temperatures. The excess heat capacities due to the internal electronic energy levels of Dy/sup +3/ in DyF/sub 3/ and of Er/sup +3/ in ErF/sub 3/ were calculated from calorimetric results. In the case of DyF/sub 3/, the eight Kramer's doublets derived from spectroscopic measurements were used to calculate an excess heat capacity which is in good agreement with the calorimetric data.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 5558727
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 80:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CALORIMETRY
DYSPROSIUM COMPOUNDS
DYSPROSIUM FLUORIDES
ERBIUM COMPOUNDS
ERBIUM FLUORIDES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LOW TEMPERATURE
MEDIUM TEMPERATURE
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
VERY LOW TEMPERATURE