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Electrical conductivity of hydrous wadsleyite

Claudia Romano, Brent T. Poe, James Tyburczy and Fabrizio Nestola
Electrical conductivity of hydrous wadsleyite (in HP-HT mineral physics; implications for geosciences, Paola Comodi (prefacer), Fabrizio Nestola (prefacer) and Ross J. Angel (prefacer))
European Journal of Mineralogy (June 2009) 21 (3): 615-622


In situ complex impedance spectroscopy of H (sub 2) O-bearing wadsleyite was performed in a multianvil apparatus at 14 GPa at temperatures up to 950 degrees C in order to determine electrical conductivity. With increasing H (sub 2) O content in wadsleyite the electrical conductivity increases at a rate higher than observed in previous studies. The activation enthalpy in the temperature range studied where proton conduction dominates is low (0.66 eV) suggesting an inevitable crossover to small polaron conduction at moderately higher temperatures, depending on H (sub 2) O concentration. Although the solubility of H (sub 2) O in wadsleyite is significant for a silicate mineral (>3 wt%), the presence of more than trace dissolved H (sub 2) O in wadsleyite is likely to result in a conductivity too high compared to recent estimates of transition-zone conductivity. The use of complex impedance spectroscopy shows that the frequency dependence of electrical properties is very different in the case of H (sub 2) O-bearing silicate phases. At frequencies below 1000 Hz complex impedance spectra contain strong features which likely result from the sample-electrode interface such that including the low-frequency data would lead to artificially low conductivities.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 21
Serial Issue: 3
Title: Electrical conductivity of hydrous wadsleyite
Title: HP-HT mineral physics; implications for geosciences
Author(s): Romano, ClaudiaPoe, Brent T.Tyburczy, JamesNestola, Fabrizio
Author(s): Comodi, Paolaprefacer
Author(s): Nestola, Fabrizioprefacer
Author(s): Angel, Ross J.prefacer
Affiliation: Universita di Roma Tre, Dipartimento di Scienze Geologiche, Rome, Italy
Affiliation: Universita di Perugia, Perugia, Italy
Pages: 615-622
Published: 200906
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Mineralogical International School; HP-HT mineral physics; implications for geosciences
Meeting location: Bressanone, ITA, Italy
Meeting date: 20080211Feb. 11-15, 2008
References: 24
Accession Number: 2009-066491
Categories: General geophysics
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Universita di Padua, ITA, ItalyVirginia Polytechnic Institute and State University, USA, United StatesUniversita "G. d'Annunzio", ITA, ItalyArizona State University, USA, United StatesUniversita di Padova, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200936
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