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The Journal of Chemical Physics : Glassy properties and viscous slowing down: An analysis of the correlation between nonergodicity factor and fragility

By Kristine Niss, Cécile Dalle-Ferrier, Valentina M. Giordano, Giulio Monaco, Bernhard Frick et al

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Book Id: WPLBN0002169514
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 20 November 2008

Title: The Journal of Chemical Physics : Glassy properties and viscous slowing down: An analysis of the correlation between nonergodicity factor and fragility  
Author: Kristine Niss, Cécile Dalle-Ferrier, Valentina M. Giordano, Giulio Monaco, Bernhard Frick et al
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), The Journal of Chemical Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Cécile Dalle-Ferrier, Valentina M. Giordano, Giulio Monaco, Bernhard Frick Et A, K. N. (n.d.). The Journal of Chemical Physics : Glassy properties and viscous slowing down: An analysis of the correlation between nonergodicity factor and fragility. Retrieved from http://community.worldlibrary.net/


Description
Description: We present an extensive analysis of the proposed relationship [ T. Scopigno et al., Science 302, 849 (2003) ] between the fragility of glass-forming liquids and the nonergodicity factor as measured by inelastic x-ray scattering. We test the robustness of the correlation through the investigation of the relative change under pressure of the speed of sound, nonergodicity factor, and broadening of the acoustic exitations of a molecular glass former, cumene, and of a polymer, polyisobutylene. For polyisobutylene, we also perform a similar study by varying its molecular weight. Moreover, we have included new results on liquids presenting an exceptionally high fragility index m under ambient conditions. We show that the linear relation, proposed by Scopigno et al. [Science 302, 849 (2003) ] between fragility, measured in the liquid state, and the slope α of the inverse nonergodicity factor as a function of T/Tg, measured in the glassy state, is not verified when increasing the data base. In particular, while there is still a trend in the suggested direction at atmospheric pressure, its consistency is not maintained by introducing pressure as an extra control parameter modifying the fragility: whatever is the variation in the isobaric fragility, the inverse nonergodicity factor increases or remains constant within the error bars, and one observes a systematic increase in the slope α when the temperature is scaled by Tg(P). To avoid any particular aspects that might cause the relation to fail, we have replaced the fragility by other related properties often evoked, e.g., thermodynamic fragility, for the understanding of its concept. Moreover, we find, as previously proposed by two of us [ K. Niss and C. Alba-Simionesco, Phys. Rev. B 74, 024205 (2006) ], that the nonergodicity factor evaluated at the glass transition qualitatively reflects the effect of density on the relaxation time even though in this case no clear quantitative correlations appear.

 

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