Dissociation energies of the molecules RhTh and RhU from high temperature mass spectrometry and predicted thermodynamic stabilities of selected diatomic actinide--platinum metal intermetallic molecules

Journal Article · Sat Jul 15 00:00:00 EDT 1978 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.436640· OSTI ID:6753013

Gingerich, K A; Gupta, S K

Gaseous RhTh and RhU have been observed in a Knudsen effusion mass spectrometric investigation of a thorium--uranium-rhodium--graphite system at high temperatures (2400--2700 /sup 0/K). Thermodynamic treatment of the experimental data yielded the atomization energies of RhTh and RhU as D/sup 0//sub 298/(RhTh) =513 +- 21 kJ mole/sup -1/ or 122.6 +- 5 kcal mole/sup -1/ and D/sup 0//sub 298/(RhU) =519 +- 17 kJ mole/sup -1/ or 124.0 +- 4 kcal mole/sup -1/. These values were derived from the third law enthalpies. The known experimental bond energies for the ligand-free gaseous intermetallic compounds between the actinides and the platinum metals have been interpretated in terms of a previously developed model based on the Brewer--Engel approach. Also, calculations are presented for the dissociation energies of certain selected actinide--platinum metal diatomic molecules which have not yet been experimentally observed.

• Research Organization: Department of Chemistry, Texas AandM University, College Station, Texas 77843
• OSTI ID: 6753013
• Journal Information: J. Chem. Phys.; (United States), Vol. 69:2
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
RHODIUM COMPOUNDS
DISSOCIATION HEAT
THORIUM COMPOUNDS
URANIUM COMPOUNDS
FORMATION HEAT
GRAPHITE
INTERMETALLIC COMPOUNDS
MASS SPECTROSCOPY
VERY HIGH TEMPERATURE
ACTINIDE COMPOUNDS
ALLOYS
CARBON
ELEMENTS
ENTHALPY
NONMETALS
PHYSICAL PROPERTIES
REACTION HEAT
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory