Size and shape effect on the phase transitions in a small system with fractal interphase boundaries

Федосеев, В.Б.; Потапов, А.А.; Шишулин, А.В.; Федосеева, Е.Н.

Авторы: Федосеев В.Б., Потапов А.А., Шишулин А.В., Федосеева Е.Н.
Журнал: Eurasian physical technical journal
Том: 14
Номер: 1
Год издания: 2017
Первая страница: 18
Последняя страница: 24
Аннотация: Shape effect as a property of small-volume systems is considered using an example of a Bi-Sb stratifying solid solution. Phase diagrams which demonstrate phase equilibria dependence on the shape of the system’s boundaries, are calculated by the methods of equilibrium chemical thermodynamics. Shape of the system is modeled by a coefficient, which is equal to the ratio between the system’s surface area and the surface area of a sphere of the same volume. Core-shell configurations are considered where the shape of the system’s external boundary is a parameter and can differ, and a core phase’s shape is spherical. The shape of a shell-phase's external boundary affects components’ mutual solubilities, the upper critical dissolution temperature and core- and shell-phases' volume ratio. The temperature range of heterogeneous states’ thermodynamical stability narrows down and the area of metastable states broadens with an increasing in the shape coefficient. This model can also be used when a shell-phase’s shape is fractal. In this case, on the one hand, the fractal dimension can be regarded as a thermodynamical function, on the other hand, it can be measured experimentally.
Добавил в систему: Шишулин Александр Владимирович

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