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First-principles study of diffusion and viscosity of anorthite (CaAl2Si2O8) liquid at high pressure
-
Bijaya B. Karki
,
Bidur Bohara
Published/Copyright:
April 2, 2015
Abstract
We have carried out equilibrium molecular dynamics simulations of CaAl2Si2O8 (anorthite) liquid as a function of pressure (up to 160 GPa) and temperature (2500 to 6000 K) within density functional theory. Along the 3000 K isotherm, the Ca self-diffusivity varies most (decreasing by two orders of magnitude between 0 and 50 GPa), whereas the self-diffusion coefficients of Al, Si, and O vary anomalously- they initially increase with pressure, reach the broad maxima (around 5 GPa), and then decrease upon further compression. The calculated melt viscosity also shows a weak anomalous behavior with a local minimum around a similar pressure. Temperature suppresses the dynamical anomalies as well as the overall pressure variations. Therefore, the curvatures of the diffusivity (viscosity) isotherms change from a concave (convex) shape at 3000 K to a convex (concave) shape at 6000 K. We find that anorthite liquid is much more mobile than silica liquid because of its high content of non-bridging oxygen atoms (NBO) and oxygen triclusters (O3). The predicted pressure variations can be associated with structural changes consisting of the pressure-induced maximum in the abundance of pentahedral states (fivefold Al/Si-O coordination) and rapid increase in the O3 abundance. Finally, our predicted first-principles results compare favorably with the available experimental data.
Received: 2010-7-9
Accepted: 2010-12-13
Published Online: 2015-4-2
Published in Print: 2011-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Anorthite liquid;
diffusion;
viscosity;
first-principles simulations;
high pressure
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- Translation interface modulation in NC-pyrrhotites: Direct imaging by TEM and a model toward understanding partially disordered structural states
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