Thermodynamic stability of the gaseous molecules YIrC and YIrC/sub 2/ by Knudsen effusion mass spectrometry

Journal Article · Thu Aug 28 00:00:00 EDT 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100409a028· OSTI ID:5403726

Pelino, M; Gingerich, K A; Haque, R; Bencivenni, L

In the investigation of the yttrium-iridium-carbon system by Knudsen effusion mass spectrometry, the gaseous molecules YIrC and YIrC/sub 2/ have been observed and their partial pressures measured as a function of temperature. The enthalpy, ..delta..H/sup 0//sub 0/, of the reaction Y(g) + Ir(g) + nC(graph) = YIrC/sub n/(g) (n = 1, 2) was evaluated by the third-law method as 287 +/- 20 and 258 +/- 17 kJ mol/sup -1/ for YIrC and YIrC/sub 2/, respectively. These values, combined with ancillary literature data, yield the atomization energies, ..delta..H/sub a//sup 0//sub 0/, as 999 +/- 25 and 1680 +/- 25 kJ mol/sup -1/, and the standard heats of formation, ..delta..H/sub f//sup 0//sub 298/, as 805 +/- 25 and 834 +/- 25 kJ mol/sup -1/ for the mono- and dicarbide, respectively.

• Research Organization: Universita di L'Aquila, Italy
• OSTI ID: 5403726
• Journal Information: J. Phys. Chem.; (United States), Vol. 90:18
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
IRIDIUM CARBIDES
THERMODYNAMICS
YTTRIUM COMPLEXES
EXPERIMENTAL DATA
FORMATION FREE ENTHALPY
FORMATION HEAT
GASES
MASS SPECTROSCOPY
TEMPERATURE DEPENDENCE
CARBIDES
CARBON COMPOUNDS
COMPLEXES
DATA
ENERGY
ENTHALPY
FLUIDS
FREE ENTHALPY
INFORMATION
IRIDIUM COMPOUNDS
NUMERICAL DATA
PHYSICAL PROPERTIES
REACTION HEAT
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties