Abstract:

Nonisothermal and isothermal decompositions of LiBF₄ were studied via TG-DTG method. Both the apparent activation energy E_a and the reaction order n got from both ways had good coherence. Furthermore,when the preexponential factor A got from isothermal decomposition was used to calculate the molecular radius by means of collision theory, the result is in good agreement with the test data. So the conclusion r that collision theory is suitable for LiBF₄’s thermal decomposition could be gotten. In addition, this conclusion could validate the high reliability of ln A.

Key words: lithium tetrafluoroborate (LiBF₄)； thermal decomposition； nonisothermal kinetics； isothermal kinetics； collision theory