Abstract
The vaporization of the lanthanum dicarbide–carbon system has been studied by Knudsen-effusion mass spectrometry over the temperature range from 2267 to 2600°K. Experimentally determined reaction enthalpies were combined with published thermodynamic data to yield the atomization energies D0.atom°(LaC2) = 1257 ± 8 kJ mole−1, D0.atom°(LaC3) = 1759 ± 31 kJ mole−1, and D0.atom°(LaC4) = 2500 ± 16 kJ mole−1. Ion intensities of the parent molecular ions La+, LaC2+, LaC3+, and LaC4+ were combined with absolute effusion measurements from the literature to obtain vapor pressure equations (1900–2600°K): logPLa = (− 2.606 × 104 / T) + 10.162, logPLaC2 = (− 3.327 × 104 / T) + 12.813, logPLaC3 = (− 4.414 × 104 / T) + 14.557, and log PLaC4 = (− 4.301 × 104 / T) + 15.067, where the units of pressure are newtons per square meter.
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