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Viscosity of an Fe‐S liquid up to 1300°C and 5 GPa
Author(s) -
LeBlanc G. E.,
Secco R. A.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl00216
Subject(s) - viscosity , activation energy , volume (thermodynamics) , analytical chemistry (journal) , materials science , viscous flow , thermodynamics , range (aeronautics) , atmospheric temperature range , mineralogy , chemistry , composite material , physics , chromatography , mechanics
Viscosity measurements of Fe 73 S 27 (wt%) liquid at pressures between 2.0 and 5.0 GPa and at temperatures in the range 1100–1300°C have been made using Stokes' method of rising spheres in conjunction with a newly developed electro‐detection technique. The viscosities range from 43.6±7.0 Pa‐s at 3.9 GPa and 1100°C to 1.6±0.5 Pa‐s at 3.0 GPa and 1300°C. These high P viscosity values are three orders of magnitude higher than the 1 atm values and are tentatively attributed to the effects of S on the size of viscous flow units. From the T and P dependences of viscosity, activation energy and volume, respectively, have been determined. Activation energy decreases with increasing P, from 405±77 kJ/mol at 2.0 GPa to 240±72 kJ/mol at 5.0 GPa, and activation volume increases with increasing T, from 1.51±0.01 cm³/mol at 1100°C to 3.61±0.19 cm³/ at 1300°C.