“…Thermodynamic properties of the reactions LnX 3 (s) + ( n /2)Al 2 X 6 (g) = LnAl n X 3 n +3 (g) in the LnX 3 −AlX 3 systems have been experimentally determined by the methods of UV−vis spectrometry, − mass spectrometry, radiochemistry, , quenching, − entrainment, and chemical vapor transport. − Standard molar enthalpies and standard molar entropies of the reactions have been derived from the measurements for the chloride vapor complexes LnAl n Cl 3 n +3 of the 16 rare earth elements Ln = Sc, , Y, , La, ,, Ce, , Pr, Nd, ,, Sm, , Eu, , Gd, ,, Tb, Dy, , Ho, ,, Er, Tm, , Yb, , and Lu 21 and interpolated for that of the radioelement Ln = Pm . However, the standard thermodynamic property values are available only for the bromide vapor complexes LnAl n Br 3 n +3 of Ln = Y 25 and La 28 and for the iodide vapor complexes LnAl n I 3 n +3 of Ln = Nd…”