Building and Breaking Bonds in Glasses leading to Three Liquid States above the Melting Temperature

Tournier, R.F.; Ojovan, M.I.

Авторы: Tournier R.F., Ojovan M.I.
Журнал: Materials
Том: 14
Номер: 9
Год издания: 2021
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 1
Последняя страница: 22
Номер статьи: 2287
DOI: 10.3390/ma14092287
Аннотация: The thermal history of melts leads to three liquid states above the melting temperaturesTm containing clusters—bound colloids with two opposite values of enthalpy +D"lg DHm and􀀀D"lg DHm and zero. All colloid bonds disconnect at Tn+ > Tm and give rise in congruent materials, through a first-order transition at TLL = Tn+, forming a homogeneous liquid, containing tiny superatoms, built by short-range order. In non-congruent materials, (Tn+) and (TLL) are separated, Tn+ being the temperature of a second order and TLL the temperature of a first-order phase transition.(Tn+) and (TLL) are predicted from the knowledge of solidus and liquidus temperatures using nonclassical homogenous nucleation. The first-order transition at TLL gives rise by cooling to a newliquid state containing colloids. Each colloid is a superatom, melted by homogeneous disintegration of nuclei instead of surface melting, and with a Gibbs free energy equal to that of a liquid droplet containing the same magic atom number. Internal and external bond number of colloids increases at Tn+ or from Tn+ to Tg. These liquid enthalpies reveal the natural presence of colloid–colloid bondingand antibonding in glass-forming melts. The Mpemba effect and its inverse exist in all melts and is due to the presence of these three liquid states.
Добавил в систему: Ожован Михаил Иванович

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Building and Breaking Bonds in Glasses leading to Three Liquid States above the Melting Temperatureстатья

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