Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..453r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 4, p. 453-456
Physics
8
Charge Carriers, Dunite, Electrical Resistivity, Olivine, Oxygen, Single Crystals, Thermodynamics, Transient Response, Crystal Defects, Grain Boundaries, Grain Size, Partial Pressure, Polarons, Seebeck Effect
Scientific paper
The electrical conductivity (sigma) of San Quintin dunite (SQD) measured between 950 and 1150 deg C at controlled oxygen fugacity (f(sub O2)) within the olivine stability field shows transients in response to changes in f(sub O2). Such behavior has not been reported previously for measurements made under similar conditions on either olivine single crystals or polycrystalline samples (dunites and lherzolites) in which olivine is the major phase. In general for olivine, an increase in f(sub O2) results in an increase in sigma. The transient is manifested as a change in sigma from a stable equilibrium value at a specific f(sub O2) to a quickly established subsequent value, the direction of which is opposite that of the final value that will be attained for the f(sub O2) change. This transient may be caused by a changing population of electrons produced by oxygen vacancies, the grain boundaries, or a short-lived defect. We postulate that the transient is observed in this particular dunite because of its large surface area to volume ratio. The transient is more pronounced at relatively high f(sub O2)s and temperatures between 950 and 1100 C. At relatively low f(sub O2)s and temperatures higher than 1100 C, the effect is diminished. The Seebeck coefficient (S), at 1200 C, is slightly smaller than that reported for single-crystal olivine, and at 1100 C is similar to that reported for single crystal olivine.
Duba Alfred G.
Roberts Jeffery J.
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