Details
| Original language | English |
|---|---|
| Pages (from-to) | 531-541 |
| Number of pages | 11 |
| Journal | Physics and chemistry of minerals |
| Volume | 39 |
| Issue number | 7 |
| Publication status | Published - 29 Apr 2012 |
Abstract
In this study, the electrical conductivity of synthetic and natural orthopyroxene single crystals containing various amounts of hydrogen and cation impurities (i. e., Al, Fe) was investigated using impedance spectroscopy. A new cell was developed to measure conductivities of submillimeter-sized oriented single crystals with impedances up to 10 10 Ohm. In contrast to previous studies on olivine and orthopyroxene, results from this study do not show a simple correlation of the concentration of protons and the electrical conductivity. Instead, the electrical conductivity appears to be a complex function of iron content, hydrogen content, crystal orientation and concentration of other impurity cations and shows similar activation energies to hydrogen diffusion. Model calculations considering proton conduction rather exclude than suggest orthopyroxene as responsible phase for high-conductivity regions in the Earth's upper mantle.
Keywords
- Electrical conductivity, Enstatite, Hydrogen, Orthopyroxene, Point defect
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Physics and chemistry of minerals, Vol. 39, No. 7, 29.04.2012, p. 531-541.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electrical conductivity of H-bearing orthopyroxene single crystals measured with impedance spectroscopy
AU - Schlechter, Elke
AU - Stalder, Roland
AU - Behrens, Harald
N1 - Funding Information: The project was funded by the German Science Foundation (DFG grants STA645/4-1,2 und BE1720/18-1,2).
PY - 2012/4/29
Y1 - 2012/4/29
N2 - In this study, the electrical conductivity of synthetic and natural orthopyroxene single crystals containing various amounts of hydrogen and cation impurities (i. e., Al, Fe) was investigated using impedance spectroscopy. A new cell was developed to measure conductivities of submillimeter-sized oriented single crystals with impedances up to 10 10 Ohm. In contrast to previous studies on olivine and orthopyroxene, results from this study do not show a simple correlation of the concentration of protons and the electrical conductivity. Instead, the electrical conductivity appears to be a complex function of iron content, hydrogen content, crystal orientation and concentration of other impurity cations and shows similar activation energies to hydrogen diffusion. Model calculations considering proton conduction rather exclude than suggest orthopyroxene as responsible phase for high-conductivity regions in the Earth's upper mantle.
AB - In this study, the electrical conductivity of synthetic and natural orthopyroxene single crystals containing various amounts of hydrogen and cation impurities (i. e., Al, Fe) was investigated using impedance spectroscopy. A new cell was developed to measure conductivities of submillimeter-sized oriented single crystals with impedances up to 10 10 Ohm. In contrast to previous studies on olivine and orthopyroxene, results from this study do not show a simple correlation of the concentration of protons and the electrical conductivity. Instead, the electrical conductivity appears to be a complex function of iron content, hydrogen content, crystal orientation and concentration of other impurity cations and shows similar activation energies to hydrogen diffusion. Model calculations considering proton conduction rather exclude than suggest orthopyroxene as responsible phase for high-conductivity regions in the Earth's upper mantle.
KW - Electrical conductivity
KW - Enstatite
KW - Hydrogen
KW - Orthopyroxene
KW - Point defect
UR - http://www.scopus.com/inward/record.url?scp=84862558418&partnerID=8YFLogxK
U2 - 10.1007/s00269-012-0509-9
DO - 10.1007/s00269-012-0509-9
M3 - Article
AN - SCOPUS:84862558418
VL - 39
SP - 531
EP - 541
JO - Physics and chemistry of minerals
JF - Physics and chemistry of minerals
SN - 0342-1791
IS - 7
ER -