Journal ArticleDOI
Electrical conduction in olivine
TLDR
In this paper, the authors reported detailed measurements of electrical conductivity σ and thermoelectric effect S in the mineral olivine and in synthetic forsterite as functions of temperature in the range from 1000° to 1500°C and oxygen partial pressure, and they interpreted the results to show that both materials have mixed ionic and extrinsic electronic conduction under these conditions.Abstract:
This paper reports detailed measurements of electrical conductivity σ and thermoelectric effect S in the mineral olivine and in synthetic forsterite as functions of temperature in the range from 1000° to 1500°C and oxygen partial pressure in the range from 10−10 to 104 Pa. The two most striking observations are strong conductivity anisotropy in forsterite and a sign change in S in olivine at 1390°C. These results are interpreted to show that both materials have mixed ionic and extrinsic electronic conduction under these conditions. On the basis of these interpretations, we infer that forsterite conductivity is dominated by electronic conduction in the a and b directions and probably by movement involving magnesium vacancies in the c direction, where far higher, PO2-independent conductivity is observed. Olivine appears to show mixed conduction under all the circumstances observed; at low temperatures, electron holes dominate but are superseded by magnesium vacancies at high temperatures.read more
Citations
More filters
Journal ArticleDOI
Electronically conductive phospho-olivines as lithium storage electrodes
TL;DR: It is shown that controlled cation non-stoichiometry combined with solid-solution doping by metals supervalent to Li+ increases the electronic conductivity of LiFePO4 by a factor of ∼108, which may allow development of lithium batteries with the highest power density yet.
Journal ArticleDOI
The role of hydrogen in the electrical conductivity of the upper mantle
TL;DR: In this article, the authors used experimental data on the solubility and diff usivity of hydrogen in olivine to estimate its effect on the electrical conductivity of the upper mantle.
Journal ArticleDOI
Diffusion of hydrogen in olivine: Implications for water in the mantle
TL;DR: In this article, single crystals from San Carlos in Arizona have been annealed at temperatures between 800° and 1000°C under hydrothermal conditions at a confining pressure of 300 MPa.
Journal ArticleDOI
The effect of water on the electrical conductivity of olivine
TL;DR: In this paper, the electrical conductivity of synthetic polycrystalline olivine was determined from a.c. impedance measurements at a pressure of 4 GPa for a temperature range of 873-1,273 K for water contents of 0.01-0.08 wt%.
Journal ArticleDOI
The effect of water on the electrical conductivity of olivine aggregates and its implications for the electrical structure of the upper mantle
TL;DR: In this article, the electrical conductivity of San Carlos olivine aggregate of various water content was measured at a pressure of 10 GPa in a Kawai-type multi-anvil apparatus.
References
More filters
Book ChapterDOI
Relations between the Concentrations of Imperfections in Crystalline Solids
F.A. Kröger,H.J. Vink +1 more
TL;DR: In this paper, a study on relations between the concentrations of imperfections in crystalline solids is presented, and a new treatment of these problems by making use of a graphical representation is presented.
Journal ArticleDOI
Fe‐Mg lattice diffusion in olivine
D. K. Buening,Peter R. Buseck +1 more
TL;DR: In this article, the authors measured the Fe-Mg interdiffusion coefficients and activation energies for single crystals of San Carlos olivine and found that the activation energies are proportional to pO2(0.172) with an accuracy in the exponent of ± 0.022.
Journal ArticleDOI
New Technique for Decorating Dislocations in Olivine
TL;DR: This simple dislocation decoration technique greatly reduces the cost and time involved in surveying the dislocation structures of deformed olivine crystals and opens the way to a more thorough understanding of the deformation of this important geologic material.
Journal ArticleDOI
On the nonstoichiometry and point defects of olivine
A. Nakamura,H. Schmalzried +1 more
TL;DR: In this article, the point-defect thermodynamics for fayalite and olivine solid solutions (FexMg1−x)2SiO4.