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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Physical-chemical nature of glass transition processтезисы доклада
- Авторы: Minaev V., Timoshenkov S., Vassiliev V., Kalugin V., Mukimov D.
- Сборник: 1st Joint Meeting of DGG – ACerS GOMD, Aachen, Germany 25 – 30 May 2014
- Том: 1
- Тезисы
- Год издания: 2014
- Место издания: Aachen University Aachen, Germany
- Первая страница: 169
- Аннотация: Physical-chemical nature of glass transition process V.S.Minaev12, S.P.Timoshenkov2, V.P.Vasiliev2, V.V.Kalugin2, D.Zh.Mukimov2 1Research Institute of Material Science and Technology, Russia; 2National Research University of Electronic Technology, Russia 3 Lomonosov Moscow State University, Chemical department The analysis of the glass transition process has been carried out on the base of the concept of the polymeric-polymorphoid structure of glass and glassforming liquid of individual chemical substances. The glass-forming Se, GeSe2, BeCl2, SiO2, P2O5, H2O and so on in crystal state usually exist in the form of two (or more) polymorphous modifications (PMs) - a high temperature modification (HTPM) and a low temperature (LTPM) - which are stable in certain temperature intervals and undergo the polymorphous transformation at Ttr. Intertransformation temperature of different PM’s polymorphoids in glassforming substance (Tw-rev), named as Tg in 1950s instead of Tamman’s windung temperature Tw is an analogue of Ttr in crystal substance. A liquid substance is formed at melting of HTPM and consists mainly of structural fragments of HTPM and some quantity of LTPM structural fragments that have no translation symmetry (a long-range order) but have short range orders and an intermediate-range order inherent to one or another PM and therefore called polymorphoids. Co-polymerization and inter-transformation of polymorphoids of different PMs (LTPM into HTPM in interval Tm...Tw-rev and HTPM into LTPM below Tw-rev) at cooling of a liquid substance is the main reason of formation of the nanoheteromorphous glass. Concentration ratio of different PM polymorphoids (CRP) change accompanies the process of vitrification from Tm to Tamman’s Tg - temperature of transformation of viscous-flow liquid into brittle solid glassy state.
- Добавил в систему: Васильев Валерий Петрович