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Recebido em 2/2/99; aceito em 22/2/00 ABOUT THE USE OF THERMOGRAVIMETRIC DATA TO ESTIMATE THERMOCHEMICAL PARAMETERS FOR COORDINATION COMPOUNDS: THE LANTHANIDE ELEMENTS. By using thermochemical data reported for a series of chelates of the type [Ln(thd) 3 ], thd = 2, 2, 6, 6 -tetramethyl-3,5-heptanedione and Ln = La, Pr, Nd, Sm, Gd, Tb, Ho, Er, Tm and Yb, empirical correlations were found involving thermochemical parameters (e.g. dissociation enthalpy) and the thermodynamic temperatures of thedoi:10.1590/s0100-40422000000500002 fatcat:4wtia3wa3rcujmfzojigbij5t4