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Complex electrical conductivity of biotite and muscovite micas at elevated temperatures: a comparative study

Saltas Vassilios, Pentari Despoina, Vallianatos, Filippos

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URIhttp://purl.tuc.gr/dl/dias/B08CA33F-18A6-4213-A367-2513391594A6-
Identifierhttps://doi.org/10.3390/ma13163513-
Identifierhttps://www.mdpi.com/1996-1944/13/16/3513/htm-
Languageen-
Extent20 pagesen
Extent3,94 megabytesen
TitleComplex electrical conductivity of biotite and muscovite micas at elevated temperatures: a comparative studyen
CreatorSaltas Vassiliosen
CreatorPentari Despoinaen
CreatorΠενταρη Δεσποιναel
CreatorVallianatos, Filipposen
PublisherMDPIen
Content SummaryThe unique physicochemical, electrical, mechanical, and thermal properties of micas make them suitable for a wide range of industrial applications, and thus, the interest for these kind of hydrous aluminosilicate minerals is still persistent, not only from a practical but also from a scientific point of view. In the present work, complex impedance spectroscopy measurements were carried out in muscovite and biotite micas, perpendicular to their cleavage planes, over a broad range of frequencies (10−2 Hz to 106 Hz) and temperatures (473–1173 K) that have not been measured so far. Different formalisms of data representation were used, namely, Cole-Cole plots of complex impedance, complex electrical conductivity and electric modulus to analyze the electrical behavior of micas and the electrical signatures of the dehydration/dehydroxylation processes. Our results suggest that ac-conductivity is affected by the structural hydroxyls and the different concentrations of transition metals (Fe, Ti and Mg) in biotite and muscovite micas. The estimated activation energies, i.e., 0.33–0.83 eV for biotite and 0.69–1.92 eV for muscovite, were attributed to proton and small polaron conduction, due to the bound water and different oxidation states of Fe.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2021-06-22-
Date of Publication2020-
SubjectMicaen
SubjectBiotiteen
SubjectMuscoviteen
SubjectImpedance spectroscopyen
SubjectElectrical conductivityen
SubjectElectric modulusen
SubjectHigh temperatureen
Bibliographic CitationV. Saltas, D. Pentari, and F. Vallianatos, “Complex electrical conductivity of biotite and muscovite micas at elevated temperatures: a comparative study,” Materials, vol. 13, no. 16, Aug. 2020. doi: 10.3390/ma13163513en

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