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Electrical conductivity of polycrystalline olivine containing a silicate glass
Author(s) -
Wanamaker B. J.,
Duba A. G.
Publication year - 1993
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 - 10.1029/93gl01886
Subject(s) - olivine , crystallite , conductivity , silicate , liquidus , mineralogy , materials science , analytical chemistry (journal) , mineral redox buffer , activation energy , electrical resistivity and conductivity , crystal (programming language) , thermal conduction , geology , chemistry , composite material , metallurgy , mantle (geology) , paleontology , organic chemistry , alloy , chromatography , engineering , computer science , electrical engineering , programming language
The complex impedance of a polycrystalline sample of San Carlos olivine including 5 vol% of a synthetic silicate glass containing sodium, magnesium, and iron has been measured as a function of temperature under controlled oxygen fugacity at a.c. frequencies of 10², 10³, and 10 4 Hz. Below ∼800°C, the conductivity of the sample is at least 5 to 10 times higher than that of single crystal and polycrystalline San Carlos olivine, respectively, and has an activation energy half that of the single crystal. The sample conductivity increases dramatically as a function of the measurement frequency. Hysteresis and time‐dependent changes in sample conductivity are observed above the liquidus of the glass (∼900°C). The data suggest that the electrical conductivity of partially molten samples is characterized by parallel conduction of the solid and melt phases and is a sensitive indicator of melt distribution as well as the kinetics of melt re‐equilibration.