Peculiarities of kinetics of the solid-solid phase transition between single-phase and two-phase states in a nanopowder are considered here. We present a numerical assessment of the time-dependent behaviour of a supersaturated nanosystem undergoing temperature cycling. We demonstrate a distinct size-induced hysteresis and its peculiarities. The analysis indicates that as the system size decreases the hysteresis loop narrows, showing a tendency to disappearance. The model predictions are demonstrated for a sample system with general hypothetical properties. The results are found to depend on such thermodynamic and kinetic constraints as the size, the rate of temperature cycling, energy barriers for nucleation and diffusion, mechanisms of nucleation, and scatter in particle sizes of a nanopowder. The newly obtained results may be used for the achievement of an alternative method of information recording in present-day and future technologies.
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