The total vapor pressures of the lanthanum trihalides LaCl 3 , LaBr 3 , and LaI 3 were measured by the torsion method, and their temperature dependence can be expressed by the following selected equations in the covered temperature ranges: LaCl 3 (s): log(p/kPa) ) (12.31 ( 0.10) -(17012 ( 100) K/T (1006-1122 K). LaCl 3 (l): log(p/kPa) ) (9.65 ( 0.23) -(13989 ( 272 K/T (1137-1188 K). LaBr 3 (s): log(p/kPa) ) (11.71 ( 0.20) -(15392 ( 150 K/T (955-1045 K). LaI 3 (s): log(p/kPa) ) (11.10 ( 0.20) -(14098 ( 200 K/T (932-1038 K). LaI 3 (l): log(p/kPa) ) (8.39 ( 0.15) -(11306 ( 200 K/T (1055-1123 K). Treating by second-and third-law methods the obtained results, the standard sublimation enthalpies, ∆ sub H°(298 K)) 334 ( 5, 308 ( 5, and 285 ( 3 kJ mol -1 for LaCl 3 , LaBr 3 , and LaI 3 , respectively, were determined.
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