The position and importance of thermal analysis among methods of material research and structure elucidation is well shown by the review which appeared inResearch and Development Journal.1According to the review, about 42% of the laboratories surveyed are using, or expect to be using in the near future, thermogravimetric (TG), differential thermal analysis (DTA), or differential scanning calorimetric (DSC) devices. It is also characteristic that about 1 to 2% of the papers appearing yearly on analytical chemistry deal with the problems of thermal analysis.2,3It is clearly shown by these data that thermal methods of analysis cannot compete with electroanalytical, spectroscopic, and chromatographic methods with respect to practical applications. Nevertheless, they play an important part in material research. If used and interpreted properly, methods of thermal analysis provide unique information in both theoretical and practical respects about the thermal behavior of samples.