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  • 1
    Online Resource
    Online Resource
    Pressure dependence of the electrical conductivity of (Mg 0.9 Fe 0.1 )SiO 3 perovskite
    American Geophysical Union (AGU) ; 1993
    In:  Journal of Geophysical Research: Solid Earth Vol. 98, No. B1 ( 1993-01-10), p. 501-508
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 98, No. B1 ( 1993-01-10), p. 501-508
    Abstract: The electrical conductivity of (Mg 0.9 Fe 0.1 )SiO 3 perovskite has been measured at pressures of 0–8 GPa and ambient temperature using a DIA‐6 cubic‐anvil apparatus. At ambient conditions, the electrical conductivity of the (Mg 0.9 Fe 0.1 )SiO 3 perovskite is found to be 7.6 (±2.0) ×10 −9 S/m. The conductivity of the perovskite increases with increasing pressure, and the activation volume for electrical conduction is determined to be −0.12 (±0.04) cm 3 /mol. As a cross‐check with previous electrical conductivity measurements, an assemblage of the perovskite and magnesiowüstite synthesized from the (Mg 0.89 Fe 0.11 ) 2 SiO 4 olivine has been examined in the present study using a laser‐heated diamond anvil cell at ∼ 48 GPa and in the temperature range of 295–3500 K. The results for this assemblage are consistent with those for the pure (Mg 0.9 Fe 0.1 )SiO 3 perovskite. The present experimental data show that the electrical conductivity of the crystalline (Mg 0.9 Fe 0.1 )SiO 3 perovskite remains below 10 −5 S/m at 300 K and lower mantle pressures.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/92JB01816
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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    detail.hit.zdb_id: 3094219-6
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    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Effect of iron content on the electrical conductivity of Perovskite and Magnesiowüstite assemblages at lower mantle conditions
    American Geophysical Union (AGU) ; 1991
    In:  Journal of Geophysical Research: Solid Earth Vol. 96, No. B4 ( 1991-04-10), p. 6113-6120
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 96, No. B4 ( 1991-04-10), p. 6113-6120
    Abstract: We have measured the electrical conductivity of (Mg 0.76 Fe 0.24 )SiO 3 perovskite and of an assemblage of (Mg 0.89 Fe 0.11 )SiO 3 perovskite + (Mg 0.70 Fe 0.30 )O magnesiowüstite at pressures of 45–80 GPa and temperatures from 295 to 3600 K. The apparent activation energy for electrical conduction is 0.24 (± 0.10) eV for the perovskite and 0.20 (± 0.08) eV for the perovskite + magnesiowüstite assemblage. Comparing our present results with those derived previously for Fe‐poor samples, we find that the electrical conductivities of both the silicate perovskite and the perovskite + magnesiowüstite assemblage depend strongly on iron content. Thus the electrical conductivity distribution inside the Earth could provide an important constraint in modeling the composition of the lower mantle.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/90JB02632
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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    detail.hit.zdb_id: 3094268-8
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    detail.hit.zdb_id: 3094219-6
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    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Proof of the equivalence theorem in the chiral lagrangian formalism
    Elsevier BV ; 1994
    In:  Physics Letters B Vol. 329, No. 2-3 ( 1994-6), p. 278-284
    Details
    In: Physics Letters B, Elsevier BV, Vol. 329, No. 2-3 ( 1994-6), p. 278-284
    Type of Medium: Online Resource
    ISSN: 0370-2693
    URL: Article
    DOI: 10.1016/0370-2693(94)90772-2
    RVK:
    UA 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1994
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  • 4
    Online Resource
    Online Resource
    Phases and electrical conductivity of a hydrous silicate assemblage at lower-mantle conditions
    Springer Science and Business Media LLC ; 1991
    In:  Nature Vol. 350, No. 6316 ( 1991-3), p. 332-334
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 350, No. 6316 ( 1991-3), p. 332-334
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/350332a0
    RVK:
    TA 1000
    RVK:
    UA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1991
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  • 5
    Online Resource
    Online Resource
    High pressure‐temperature electrical conductivity of magnesiowustite as a function of iron oxide concentration
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Solid Earth Vol. 95, No. B13 ( 1990-12-10), p. 21609-21612
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 95, No. B13 ( 1990-12-10), p. 21609-21612
    Abstract: The electrical conductivity of (Mg,Fe)O magnesiowüstite containing 9 and 27.5 mol % FeO has been measured at simultaneously high pressures (30–32 GPa) and temperatures using a diamond anvil cell heated with a continuous wave Nd:YAG laser and an external resistance heater. The conductivity depends strongly on the FeO concentration at both ambient and high pressures. At the pressures and temperatures of about 30 GPa and 2000 K, conditions expected in the lower mantle, the magnesiowüstite containing 27.5% FeO is 3 orders of magnitude more conductive than that containing 9% FeO. The activation energy of magnesiowüstite decreases with increasing iron concentration from 0.38 (±0.09) eV at 9% FeO to 0.29 (±0.05) eV at 27.5% FeO.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB095iB13p21609
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Laboratory studies of the electrical conductivity of silicate perovskites at high pressures and temperatures
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Solid Earth Vol. 95, No. B4 ( 1990-04-10), p. 5067-5078
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 95, No. B4 ( 1990-04-10), p. 5067-5078
    Abstract: The electrical conductivities of two silicate perovskites and a perovskite‐magnesiowüstite assemblage, all having an atomic ratio of Mg to Fe equal to 0.88/0.12, have been measured with alternating current and direct current (DC) techniques at simultaneously high pressures and temperatures. Measurements up to pressures of 80 GPa and temperatures of 3500 K using a laser‐heated diamond anvil cell demonstrate that the electrical conductivity of these materials remains below 10–3 S/m at lower mantle conditions. The activation energies for electrical conduction are between 0.1 and 0.4 eV (0.1–0.2 eV most probably) from our data, and we ascribe the conduction in these perovskites to an extrinsic electronic process. Our new measurements are in agreement with a bound that was previously obtained from DC measurements for the high PT conductivity of perovskite‐dominated assemblages. The results show that the electrical conductivity of (Mg 0.88 Fe 0.12 )SiO 3 perovskite differs significantly from that of Earth's deep mantle, as inferred from geophysical observations.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB095iB04p05067
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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    SSG: 16,13
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  • 7
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    Online Resource
    Nature of electrical charge carriers in the Earth's lower mantle from laboratory measurements
    American Geophysical Union (AGU) ; 1994
    In:  Geophysical Research Letters Vol. 21, No. 20 ( 1994-10), p. 2183-2186
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 21, No. 20 ( 1994-10), p. 2183-2186
    Abstract: Thermoelectric power measurements on a silicate‐perovskite and magnesiowüstite assemblage at lower‐mantle conditions [(Mg 0.89 Fe 0.11 ) 2 SiO 4 bulk composition at 48 GPa and temperatures up to 2500 K] yield a positive Seebeck coefficient, thus implying that the dominant charge carriers are positive and that electrons in the conduction band (intrinsic carriers) contribute little to the electrical conductivity. The present results suggest that electrical transport is likely dominated by extrinsic charge carriers throughout the entire mantle and, hence, the electrical conductivity can be a powerful tool for characterizing minor phases, impurities and defect states of the Earth's deep interior.
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/94GL01934
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 8
    Online Resource
    Online Resource
    Solid carbon at high pressure: Electrical resistivity and phase transition
    Springer Science and Business Media LLC ; 1994
    In:  Physics and Chemistry of Minerals Vol. 21, No. 1-2 ( 1994-5)
    Details
    In: Physics and Chemistry of Minerals, Springer Science and Business Media LLC, Vol. 21, No. 1-2 ( 1994-5)
    Type of Medium: Online Resource
    ISSN: 0342-1791 , 1432-2021
    URL: Article
    DOI: 10.1007/BF00205208
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1994
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  • 9
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    Online Resource
    On the precise formulation of the equivalence theorem
    American Physical Society (APS) ; 1992
    In:  Physical Review Letters Vol. 69, No. 18 ( 1992-11-2), p. 2619-2622
    Details
    In: Physical Review Letters, American Physical Society (APS), Vol. 69, No. 18 ( 1992-11-2), p. 2619-2622
    Type of Medium: Online Resource
    ISSN: 0031-9007
    URL: Article
    DOI: 10.1103/PhysRevLett.69.2619
    RVK:
    UA 1000
    RVK:
    UA 6520
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1992
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  • 10
    Online Resource
    Online Resource
    Further investigation on the precise formulation of the equivalence theorem
    American Physical Society (APS) ; 1994
    In:  Physical Review D Vol. 49, No. 9 ( 1994-5-1), p. 4842-4872
    Details
    In: Physical Review D, American Physical Society (APS), Vol. 49, No. 9 ( 1994-5-1), p. 4842-4872
    Type of Medium: Online Resource
    ISSN: 0556-2821
    URL: Article
    DOI: 10.1103/PhysRevD.49.4842
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1994
    detail.hit.zdb_id: 2844732-3
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