The molecular and ionic composition of saturated vapor over lanthanum triiodide was studied by Knudsen effusion mass spectrometry. The (LaI3)n molecules (n = 1-3) and the [I(LaI3)n]- ions (n = 0-4) were observed. The partial pressures of the molecules were determined and the enthalpies of sublimation, DsHo(298.15 K) in kJ mol-1, in the form of monomers (304 +- 7), dimers (428 +- 25), and trimers (455 +- 50) were obtained by the second and third laws of thermodynamics. The enthalpy of formation, DfHo(298.15 K) in kJ mol-1, of the LaI3 (-376 +- 10), La2I6 (-932 +- 25), La3I9 (-1585 +- 50) molecules and the LaI4- (-841 +- 24), La2I7- (-1486 +- 32) ions were determined. The electron work function, fe = 3.5 +- 0.3 eV, for the LaI3 crystal was calculated from the thermochemical cycle.
Compounds
#
Formula
Name
1
I3La
lanthanum triiodide
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.