Thermal behaviour of a few lanthanide complexes of the type ML3(I) [M=Eu,Gd; HL=4,4,4-trifluoro- 1-(2-napthyl)-1,3-butanedione and EuL30.5dmm dmm=2,6-dimethylmorpholine(II)], has been investigated. From thermogravimetric(TG) curves, the decomposition pattern
of the compounds has been analysed on the basis of mass loss data. The order and activation energy of the thermal decomposition
reactions have been elucidated. From differential thermal analysis (DTA) studies, the heat of reaction and rate of thermal
decomposition reaction have been enumerated.