Abstract
It is shown that amorphization of substances under pressure can be related to the fundamental property of the isobaric-isothermal potential surface as a function of temperature and pressure: its convexity. Amorphization is cold melting. The peaks in the pressure dependences of the melting temperature are not anomalies but a manifestation of the general case, whose implementation is limited by polymorphism. A model of the amorphous state near the absolute zero of temperature is proposed: specifically, nanoceramics formed according to the mechanism of polysynthetic twinning.
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