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DIELECTRIC LOSSES AND IONIC-CONDUCTIVITY OF LIFBA2+

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DIELECTRIC LOSSES AND IONIC-CONDUCTIVITY OF LIFBA2+
GRAMMATIKAKIS, J PAPATHANASSIOU, A BOGRIS, N MANOLOPOULOS, M and KATSIKA, V
scientific_publication_article
Επιστημονική δημοσίευση - Άρθρο Περιοδικού (EL)
Scientific publication - Journal Article (EN)
1992
Ba2+-doped LiF crystals were studied using the “dielectric loss” and “ionic conductivity” methods. By the first method we have indicated the existence of two relaxation mechanisms. The first mechanism is attributed to reorientation of ion-vacancy dipoles by means of nearest-neighbor to nearest-neighbor jumps. The estimated activation enthalpy h. and the preexponential factor tau0 are 0.43 eV and 3.30 X 10(-9) sec, respectively. The second mechanism is attributed to nearest-neighbor to next-nearest-neighbor jumps. The enthalpy parameters are h(m) = 0.34 eV and tau0 = 2.75 X 10(-8)sec. By the ionic conductivity method the migration enthalpy of free vacancies is estimated to be h(m) = 0.67 eV. (EN)
English
Ερευνητικό υλικό ΕΚΠΑ
https://creativecommons.org/licenses/by-nc/4.0/
University of Athens
Pergamos Digital Library
Journal Article



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