Jensen, Lars Rosgaard

Liu, Hao

Smedskjær, Morten Mattrup

Tao, Haizheng

Yue, Yuanzheng

Zhao, Xiujian

English

    Aalborg UniversitetA Structural Connection to the Configurational Heat Capacity of Borate-Silicate GlassForming LiquidsLiu, Hao; Smedskjær, Morten Mattrup; Tao, Haizheng; Jensen, Lars Rosgaard; Zhao, Xiujian;Yue, YuanzhengCreative Commons LicenseUnspecifiedPublication date:2017Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Liu, H., Smedskjær, M. M., Tao, H., Jensen, L. R., Zhao, X., & Yue, Y. (2017). A Structural Connection to theConfigurational Heat Capacity of Borate-Silicate Glass Forming Liquids. Abstract from Workshop on Dynamicsof Glass-forming Liquids, Copenhagen, Denmark.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: August 23, 2021A Structural Connection to the Configurational Heat Capacity of Borate-Silicate Glass Forming Liquids Hao Liu,a,b Morten M. Smedskjaera, Haizheng Taob, Lars R. Jensenc, Xiujian Zhaob, and Yuanzheng Yuea,b a Department of Chemistry and Bioscience, Aalborg University, DK-9220 Aalborg, Denmark. b State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China c Department of Mechanical and Manufacturing Engineering, Aalborg University, DK-9220 Aalborg, Denmark E-mail of the presenter: hal@bio.aau.dk  When a glass-forming liquid is supercooled to the glass transition temperature (Tg), the structural degree of freedom decreases, causing a loss of the configurational heat capacity (Cp,conf). In borate-silicate mixed glasses, the Cp,conf exhibits a non-linear increase with substitution of B2O3 for SiO2.1 However, its structural origin has not been well understood. In this work, through Raman spectroscopy measurements, we have found an implication for the intermediate range order (IRO) structural connection to the composition dependence of Cp,conf in a series of (75q)B2O3-(75(1-q))SiO2-15Na2O-10CaO glasses.2 In the silica-rich composition, the increase of the content of B-O-Si network units ([B2Si2O8]2-) and 6-membered borate rings causes the rapid increase of the Cp,conf with the addition of B2O3. In the boron-rich composition, the Cp,conf is almost constant, which is likely attributed to the counteraction between the decrease of the fraction of metaborate groups and the increase of the fraction of other borate superstructural units. As shown in Fig. 1, compared to short range order (SRO), the overall results suggest that the IRO structural change has a dominant contribution to the evolution of Cp,conf with composition. Furthermore, IRO is also found to govern the composition dependence of dynamic fragility, as illustrated in Fig. 2, implying that Cp,conf can be seen as the thermodynamic fragility in the studied system.    1 M. M. Smedskjaer, J. C. Mauro, R. E. Youngman, C. L. Hogue, M. Potuzak and Y.Z. Yue, J. Phys. Chem. B, 115, 2011, 12930. 2 H. Liu, M. M. Smedskjaer, H. Z. Tao, L. R. Jensen, X. J. Zhao and Y. Z. Yue, Phys. Chem. Chem. Phys., 18 (16), 2016, 10887. 

A Structural Connection to the Configurational Heat Capacity of Borate-Silicate Glass Forming Liquids

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A Structural Connection to the Configurational Heat Capacity of Borate-Silicate Glass Forming Liquids

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