Abstract
The dehydration process of the compounds RE(C 7H 7SO 3) 3· xH 2O (where x=2 for RE=La–Ho, Tm, Yb and Y; x=7 and 6 for RE=Er and Lu, respectively) has been investigated by thermogravimetry/derivative thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC) techniques. The TG/DTG curves show that the dehydration process does not depend on the atmosphere used. For the compounds of La–Gd, dehydration occurs in a single step while for the compounds of heavier lanthanoid (Dy–Lu) and yttrium it occurs in two stages. The total dehydration Δ H for each compound was determined by DSC and the values vary between 67 and 381 kJ mol −1 along the series.
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