Abstract
Phase transitions of copper halide particles have been investigated by optical means. A decrease of particle melting temperature with decrease of size has been found. It is shown that the observed size dependencies of crystallization and melting temperatures can be described with practically the same value of surface tension in the framework of homogeneous nucleation theory and particle melting model in which the idea about thermally activated formation of a liquid layer on the particle surface is used. It has been found that the lowest temperature at which high temperature modification of CuBr (β-phase) can be stabilized due to extra annealing of samples depends weakly on particle size. Decrease of melting temperature prevents stabilization of β-phase for particles having radii less than 5 nm.
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