Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/B08CA33F-18A6-4213-A367-2513391594A6 | - |
| Αναγνωριστικό | https://doi.org/10.3390/ma13163513 | - |
| Αναγνωριστικό | https://www.mdpi.com/1996-1944/13/16/3513/htm | - |
| Γλώσσα | en | - |
| Μέγεθος | 20 pages | en |
| Μέγεθος | 3,94 megabytes | en |
| Τίτλος | Complex electrical conductivity of biotite and muscovite micas at elevated temperatures: a comparative study | en |
| Δημιουργός | Saltas Vassilios | en |
| Δημιουργός | Pentari Despoina | en |
| Δημιουργός | Πενταρη Δεσποινα | el |
| Δημιουργός | Vallianatos, Filippos | en |
| Εκδότης | MDPI | en |
| Περίληψη | The 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 |
| Τύπος | Peer-Reviewed Journal Publication | en |
| Τύπος | Δημοσίευση σε Περιοδικό με Κριτές | el |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2021-06-22 | - |
| Ημερομηνία Δημοσίευσης | 2020 | - |
| Θεματική Κατηγορία | Mica | en |
| Θεματική Κατηγορία | Biotite | en |
| Θεματική Κατηγορία | Muscovite | en |
| Θεματική Κατηγορία | Impedance spectroscopy | en |
| Θεματική Κατηγορία | Electrical conductivity | en |
| Θεματική Κατηγορία | Electric modulus | en |
| Θεματική Κατηγορία | High temperature | en |
| Βιβλιογραφική Αναφορά | V. 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/ma13163513 | en |
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