Accession Number : AD0825266

Title :   MASS SPECTROMETRIC STUDY OF RARE EARTH-CARBON SYSTEMS. I. THE CERIUM-CARBON SYSTEM. II. ATOMIZATION ENERGY OF THE NDC4 MOLECULE.

Descriptive Note : Technical rept. 1 May 66-30 Apr 67,

Corporate Author : ROME UNIV (ITALY) ISTITUTO DI CHIMICA FISICA ED ELETTROCHIMICA

Personal Author(s) : Balducci, G. ; Capalbi, A. ; DeMaria, G. ; Guido, M.

Report Date : OCT 1967

Pagination or Media Count : 29

Abstract : The gaseous phase in thermodynamic equilibrium with the condensed cerium-carbon system was investigated by means of the combined Knudsen cell-mass spectrometric technique in the temperature range 1990-2300K. In addition to cerium atoms, the gaseous carbide molecules CeC2 and CeC4 were identified and their partial pressures measured. Using these informations the following dissociation and atomization energies were derived: 163 plus or minus 2 kcal/mole for the Ce-C2 bond energy; 305 plus or minus 1.5 kcal/mole for the atomization energy for CeC2; 609 plus or minus kcal/mole for the atomization energy of CeC4. In the temperature range 2210-2350K the NdC4 molecule was identified in the vapor in equilibrium with the Nd-C condensed system and its atomization energy was calculated to be 596 plus or minus 5 kcal/mole. (Author)

Descriptors :   *MASS SPECTROSCOPY), (*RARE EARTH COMPOUNDS, (*CARBIDES, MASS SPECTROSCOPY), VAPORS, CERIUM COMPOUNDS, CARBON, GRAPHITE, NEODYMIUM COMPOUNDS, THERMOCHEMISTRY, ATOMIZATION, DISSOCIATION, HEAT OF REACTION, FREE ENERGY, ITALY.

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE