Loss dependence on temperature

The thermal decomposition of alkali metal oxyfluoroniobates is also not a trivial process. MNbOF4 compounds (where M = alkali metal) with a chain-type structure are relatively stable up to temperatures in the range of 500-600°C. Fig. 90 presents mass loss dependences on temperature of several MNbOF4 compounds. As can be seen, among the compounds presented, only CsNbOF4 exhibits significantly different behavior, beginning its thermal decomposition at a lower temperature of about 400°C. 

Mechanical and Thermal Properties For most of the alternative membranes to Nafion , the thermal stability is studied by thermogravimetric analysis (TGA). The different weight losses depending on temperature have been determined and identified in some cases by gas chromatographic analysis [49,114]. The first weight loss is related to the membrane dehydration between room temperature and 150 °C. The second one between 250 and 350 °C was identified as a desulfonation process (SO2 and SO losses) followed by polymer matrix degradation (CO and CO2 losses). From these experiments, sPI membranes were considered as thermally stable... 

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