In DTA and DSC, various physical changes can yield exothermic and endothermic peaks. Some examples of physical changes that can cause these peaks are:
Exothermic Peaks:
- Crystallization or recrystallization
- Solid-solid phase transitions (e.g., polymorphic transitions)
- Combustion or oxidation reactions
- Decomposition of organic compounds
- Adsorption or desorption of gases
Endothermic Peaks:
- Melting or solidification
- Glass transition
- Vaporization or sublimation
- Absorption of moisture or other solvents by a sample
