Definition: Thermoperiodicity is a term used in the field of theoretical physics to describe the relationship between the temperature and the frequency of oscillations or vibrations. It refers to the phenomenon where an object, such as a crystal, can exhibit different frequencies or temperatures at different temperatures within the same material due to variations in its structure. This property allows for the creation of complex materials with unique properties based on their specific structure. In thermodynamics, the concept of thermal stress is often used to describe how the