Affiliation:
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, China + State Key laboratory of Advanced Metallurgy, University of Science and Technology Beijing, China
Abstract
A model for estimating the viscosity of silicate melt as derived in our
previous paper is extended to the system containing MgO, CaO, SrO, BaO, Li2O,
Na2O, K2O, which can express the nonlinear variation of activation energy of
viscosity with the composition. It is found that the optimized parameters of
model which characterize the deforming ability of bonds around non-bridging
oxygen decrease with increasing the bond strength of M-O bond expressed by
I=2Q/RMz+ + rO2-)2 (where Q is the valence of cation M; r is the radius). It is
pointed out that viscosity is not only determined by the bond strength, but
also by the radius of cation which is defined as the size effect. The radius
of cation plays paradox roles in the two factors: smaller radius leads to a
stronger bond, thus a higher viscosity; while cations with smaller radius are
easier to diffuse when neglecting the interaction force, thus a lower
viscosity will be.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Mechanics of Materials,Geotechnical Engineering and Engineering Geology
Cited by
23 articles.
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