Abstract
A study of the phase size effect upon the transition temperatures of cesium chloride has been carried out by thermal analysis and X-ray diffraction of samples obtained by condensation of the compound into porous materials of which the pore radii lie between 3.5 nm and 65 nm. The results show a decrease of the liquid ⇄ solid transformation point with the pore radius for both rising and falling temperatures, while the polymorphic transition temperatures are decreased for cooling and increased for heating. The polymorphic transformation vanishes for CsCl in which the pore radii are smaller than 7.7 nm. The transition temperature variations are explained by homogeneous nucleation theory.
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