Computer Science
Scientific paper
May 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971e%26psl..11..415k&link_type=abstract
Earth and Planetary Science Letters, Volume 11, Issue 1-5, p. 415-419.
Computer Science
7
Scientific paper
The electrical conductivity in three single crystal specimens of olivine (fayalite mole %; 7.4, 8.4 and 12.6) is measured along the three crystallographic orientations in the temperature range of 600° to 1200°K. There are two different mechanisms with different activation energy for electrical conduction; presumably the impurity (Fe) conduction is predominant above 800°K and extrinsic conduction is predominant below 800°K. The dependence of the pre-exponential constant σ0 and activation energy E in electrical conductivity σ upon composition and orientation is studied by the measured data above 800°K with a formula, σ = σ0 exp(-E/kT), where k and T are the Boltzmann constant and absolute temperature respectively. Slight anisotropy of electrical conductivity seems to be present; however, any tendency relating to the lattice orientation was not discovered. Combining the present data with single crystal data published so far, it is concluded that (1) activation energy (0.80 +/- 0.02) eV, is independent of chemical composition and (2) the pre-exponential constant σ0 is related to the fayalite mole percent C in such a way as logσ0 = - (3.13 +/- 0.45) + 0.14 C. A tentative interpretation of the conductivity jump at the transition layer in the earth's mantle is presented.
Kobayashi Yoji
Maruyama Hiroshi
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