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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

Online
ISSN
1865-7109
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Volume 55, Issue 11-12

Issues

AC Conduction Mechanism in Perovskite-like Dimers (C2H8NO)2M2X6, M=Co/Cu, X=Cl/Br

S.S. Montasser / M. F. Mostafa
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-2000-11-1221

AC conductivities at 5 Hz-10 kHz and 78 K up to room temperature of bis- (ethanolammonium) Co2X6, and bis- (ethanolammonium) Cu2X6, X=C1 and Br are reported. At high temperatures, band type conduction prevails for all dimers. In the low temperature range T< 200 K the (Co2Br6)-2 dimer conducts via small polarons and the other three dimers conduct via quantum mechanical tunneling. The obtained relaxation times for the different dimers were found to be 1.1 • 10-14 s. The frequency dependence follows the universal power law σac (ω) = Aωs. The exponent s and the pre-factor A were found to be very sensitive to the phase transitions, with 5 showing a minimum or maximum at the transition temperature. Changes in the conduction mechanism are reflected by abrupt changes in the variation of the pre-factor A vs 1/T relation. The conduction is found to depend on the type of the halide ion rather than on the transition metal ion.

PACS #76, 74.

: AC Conductivity; Phase Transition

About the article

Received: 2000-10-09

Published Online: 2014-06-02

Published in Print: 2000-12-01


Citation Information: Zeitschrift für Naturforschung A, Volume 55, Issue 11-12, Pages 945–956, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-2000-11-1221.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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