The activation energy of the thermal decomposition of finely _~round LaC204Br was determined according to the method of Ozawa as Ea = 203.83 kJ tool-. As compared to the value for the parent oxalate La2(C204)3 Ea= 130 ~/mol), this value is higher by about 70 kJ/mol, which is consistent with the increased interaction between the metal and oxalate ions. The substitution of Br by C1 does not affect the decomposition kinetics profoundly.
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