Origin of Negative Thermal Expansion
There are a number of physical processes which may cause contraction with increasing temperature, including transverse vibrational modes, Rigid Unit Modes and phase transitions.
Recently, Liu et al. showed that the NTE phenomenon originates from the existence of high pressure, small volume phases with higher entropy, with their configurations present in the stable phase matrix through thermal fluctuations.
Read more about this topic: Negative Thermal Expansion
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