The enthalpies of formation of the lanthanide sesquioxides have been evalua
ted from the experimental data available in literature. All experimental re
sults have been re-calculated to obtain a consistent set of data compatible
with the assessed values for the lanthanide trihalides and the aqueous lan
thanide trivalent ions, as reported previously. (C) 2001 Elsevier Science B
.V. All rights reserved.