Atomization energies of the gaseous molecules LaC and La sub 2 C by high-temperature equilibrium measurements
- Universita di L'Aquila (Italy)
- Texas A and M Univ., College Station (USA)
The Knudsen effusion mass spectrometric technique has been used to determine the thermodynamic properties of the molecules LaC and La{sub 2}C. The enthalpies of the reactions La(g) + C(graphite) = LaC(g) and 2La(g) + C(graphite) + La{sub 2}C(g) were measured in two runs in the temperature ranges 2286-2609 and 2767-2835 K, respectively, resulting in {Delta}H{sub 0}{degree} (reaction 1) = 253 {plus minus} 18 kJ mol{sup {minus}1} and {Delta}H{sub 0}{degree} (reaction 2) = -234 {plus minus} 25 kJ mol{sup {minus}1}. From these values the atomization energies, {Delta}H{sub a}{degree}{sub 0}, and standard heats of formation, {Delta}H{sub f}{degree}{sub 298.15}, were obtained as 458 {plus minus} 20 and 685 {plus minus} 20 and 685 {plus minus} 20 kJ mol{sup {minus}1} for LaC and 945 {plus minus} 28 and 625 {plus minus} 28 kJ mol{sup {minus}1} for La{sub 2}C.
- OSTI ID:
- 5040240
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:4; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
CARBIDES
CARBON COMPOUNDS
DATA
DISSOCIATION HEAT
ENTHALPY
EXPERIMENTAL DATA
FLUIDS
GASES
HIGH TEMPERATURE
INFORMATION
LANTHANUM CARBIDES
LANTHANUM COMPOUNDS
MASS SPECTROSCOPY
NUMERICAL DATA
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REACTION HEAT
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
THERMODYNAMICS