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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-
Αναγνωριστικόhttps://doi.org/10.3390/ma13163513-
Αναγνωριστικόhttps://www.mdpi.com/1996-1944/13/16/3513/htm-
Γλώσσαen-
Μέγεθος20 pagesen
Μέγεθος3,94 megabytesen
ΤίτλοςComplex electrical conductivity of biotite and muscovite micas at elevated temperatures: a comparative studyen
ΔημιουργόςSaltas Vassiliosen
ΔημιουργόςPentari Despoinaen
ΔημιουργόςΠενταρη Δεσποιναel
ΔημιουργόςVallianatos, Filipposen
ΕκδότηςMDPIen
ΠερίληψηThe 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
ΤύποςPeer-Reviewed Journal Publicationen
ΤύποςΔημοσίευση σε Περιοδικό με Κριτέςel
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2021-06-22-
Ημερομηνία Δημοσίευσης2020-
Θεματική ΚατηγορίαMicaen
Θεματική ΚατηγορίαBiotiteen
Θεματική ΚατηγορίαMuscoviteen
Θεματική ΚατηγορίαImpedance spectroscopyen
Θεματική ΚατηγορίαElectrical conductivityen
Θεματική ΚατηγορίαElectric modulusen
Θεματική ΚατηγορίαHigh temperatureen
Βιβλιογραφική ΑναφοράV. 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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