Greaves, G.N.

Pan, R.K.

Qiao, A.

Ruan, J.

Tao, H.Z.

Yue, Yuanzheng

Zhao, X.J.

    Aalborg UniversitetDynamic behavior of the 3CaO-1Al2O3 liquidPan, R.K.; Qiao, A.; Tao, H.Z.; Ruan, J.; Zhao, X.J.; Greaves, G.N.; Yue, YuanzhengPublished in:The 24th International Congress on Glass - AbstractsPublication date:2016Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Pan, R. K., Qiao, A., Tao, H. Z., Ruan, J., Zhao, X. J., Greaves, G. N., & Yue, Y. (2016). Dynamic behavior ofthe 3CaO-1Al2O3 liquid. In The 24th International Congress on Glass - Abstracts (pp. 152). InternationalCommission on Glass (ICG).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: April 30, 2017Dynamic behavior of the 3CaO-1Al2O3 liquid R.K. Pan1,2, A. Qiao1, H.Z. Tao1, J. Ruan1, X.J. Zhao1, G.N. Greaves1,3, Y.Z. Yue1,4  1State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China 2School of Materials Science and Engineering, Hubei University, Wuhan 430062, China 3Centre for Advanced Functional Materials and Devices, Institute of Mathematics and Physics, Aberystwyth University, Aberystwyth SY23 3BZ, United Kingdom 4Department of Chemistry and Bioscience, Aalborg University, DK-9220 Aalborg, Denmark panruikun5@sina.com Calcium aluminates (CaO)x(Al2O3)1-x are main components in the Earth’s mantle and also in the aluminate cement, which have been studied by many researchers.1,2) Calcium aluminates are very fragile glass formers and do not contain typical network-forming cations. The structure of (CaO)x(Al2O3)1-x with x=0.33, 0.5 and 0.75 was investigated in a laser heated aerodynamic levitation (ADL) furnace.3,4) The ADL technique enables vitrifying calcium aluminates in the composition range of 0.37 < x < 0.75, whereas the conventional melt-quenching method can vitrify only those in a much narrower x range (0.6 < x < 0.7).3) Kargl et al studied the viscous behavior of the CaAl2O4 liquid in the temperature range of 2000 to 2800 K by using ADL.5) Hennet et al studied the structural evolution of the fragile glass-forming liquid-CaAl2O4.6)   Figure 1: Viscosity η vs Tg-scaled temperature of C3A fitted to the MYEGA equation. Viscosities near Tg were determined from the relation logη=11.35+log(1/qc(Tf)).7) The slope of linear fitting to log(1/qc(Tf))~Tg/Tf plots of DSC results is the fragility m. The 3CaO-1Al2O3 (C3A) bulk glass was prepared using the ADL technique. The viscosities at high temperatures (1773~2923 K) of the C3A liquid were measured using the ADL technique as shown in Figure 1. By conducting differential scanning calorimetric (DSC) measurements, we determined the glass transition temperature (Tg=1092 K) and the dependence of fictive temperature (Tf) on cooling rate (qc). The temperature dependence of viscosity was fitted to the Mauro-Yue-Ellison-Gupta-Allan (MYEGA) equation.8) The fragility parameter m’ of the C3A liquid was determined to be about 74 by extrapolating the MYEGA fitting curve to the Tg, while m was determined using DSC to be about 33. This implies that the fragile-to-strong liquid transition occurs in the C3A liquid upon cooling.9) 1) G. Urbain, viscosity of liquids system CaO-Al2O3, Rev. Int. Hautes Temp. Ref. Fr. 20 (1983) 135-139. 2) J.W.E. Drewitt, L. Hennet, A. Zeidler, S. Jahn, P.S. Salmon, D.R. Neuville, H.E. Fischer, Structural transformations on vitrification in the fragile glass-forming system CaAl2O4, Phys. Rev. Lett. 109 (2012) 235501. 3) J.W.E Drewitt, S. Jahn, V. Cristiglio, A. Bytchkov, M. Leydier, S.Brassamin, H.E Fischer, L. Hennet, Corrigendum: The structure of liquid calcium aluminates as investigated by neutron and high-energy x-ray diffraction in combination with molecular dynamics simulation methods, J. Phys.: Condens. Matter. 24 (2012) 099501. 4) D. Langstaff, M. Gunn, G.N. Greaves, A. Marsing, F. Kargl, Aerodynamic levitator furnace for measuring thermophysical properties of refractoryliquids, Rev. Sci. Instrum. 84 (2013)124901. 5) F. Kargl, C.C. Yuan, G.N. Greaves, Aerodynamic Levitation: Thermophysical property measurements of liquid oxides, Int. J. Microgravity Sci. Appl. 32 (2015) 320200. 6) L. Hennet, I. Pozdnyakova, A. Bytchkov, D.L. Price, Development of structural order during supercooling of a fragile oxide melt, J. Chem. Phys., 126 (2007) 074906. 7) Y.Z. Yue, R. von der Ohe, S.L. Jensen, Fictive temperature, cooling rate, and viscosity of glasses, J. Chem. Phys., 120 (2004)8053. 8) J.C. Mauro, Y.Z. Yue, A.J. Ellison, P.K. Gupta, D.C. Allan, Viscosity of glass-forming liquids, Proc. Natl. Acad. Sci. U.S.A. 106 (2009) 19780-19784. 9) C.Z. Zhang, L.N. Hu, Y.Z. Yue, J.C. Mauro, Fragile-to-strong transition in metallic glass-forming liquids, J. Chem. Phys. 133 (2010) 014508. 

Dynamic behavior of the 3CaO-1Al2O3 liquid

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Dynamic behavior of the 3CaO-1Al2O3 liquid

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