Kinetics of relaxation and crystallization of sodium metaphosphate glass

Autor:	Isak Avramov, Ts. Vassilev, Ch. Tzvetkova
Rok vydání:	2009
Předmět:	Chemistry Kinetics Thermodynamics Mineralogy Activation energy Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Viscosity Fragility law Materials Chemistry Ceramics and Composites Relaxation (physics) Crystallization Glass transition Dimensionless quantity
Zdroj:	Journal of Non-Crystalline Solids. 355:23-28
ISSN:	0022-3093
Popis:	Kinetics of structural relaxation and crystallization of NaPO 3 glassforming melt is studied by means of thermal analyses. It is demonstrated that activation energy depends strongly on fictive temperature T f . The dependence of the onset temperature T o of the glass transition interval on the heating rate q + is investigated for samples that were previously cooled down at a rate q − of about 850 K/min. The dimensionless fragility F is a measure of the dependence of the activation energy for spatial rearrangement on the changes of structure. According to the present results F is large for NaPO 3 (i.e. phosphates are ‘fragile’ substances).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fa6b6e03a212be3d9b26e2af5b3d70db https://doi.org/10.1016/j.jnoncrysol.2008.09.035 Zobrazit plný text záznamu Full Text from ScienceDirect