Mobility and conductivity of ionic and bonded defects
in hydrogen-bonded chains with nonlinear interactions |
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Authors: | A S Tchakoutio Nguetcho P B Ndjoko T C Kofane |
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Institution: | (1) Laboratoire de Mécanique, Département de Physique, Faculté des Sciences, Université de Yaoundé I, B.P. 812, Yaoundé, Cameroun;(2) International Chair of Mathematical Physics and Applications ICMPA-UNESCO Chair, 072 BP50, Cotonou, Université d'Abomey-Calavi, BP 50, 072 Cotonou, Benin;(3) The Abdus Salam International Centre for Theoretical Physics, P.O. Box 586 Strada Costiera, II-34014 Trieste, Italy |
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Abstract: | The proton conductivity and the mobility arising from motions of the
ionic and bonded defects, in hydrogen-bonded molecular systems are
investigated by means of the quantum mechanical method. Our two component
model goes beyond the usual classical harmonic interaction by inclusion of a
quartic interaction potential between the nearest-neighbor protons. Among
the rich variety of soliton patterns obtained in this model, we focus our
attention to compact kink (kinkon) solutions to calculate analytically, the
mobility of the kinkon-antikinkon pair and the specific
electrical-conductivity of the protons transfer in the hydrogen-bonded
systems under an externally applied electrical-field through the dynamic
equation of the kinkon-antikinkon pair. For ice, the mobility and the
electrical conductivity of the proton transfer obtained are about
5.307×10-7 m2 V-1 s-1
and 6.11×10-4 Ω-1 m-1, respectively. The results
obtained are in qualitative agreement with experimental data. |
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Keywords: | 62 30 +d Mechanical and elastic waves Vibrations 63 20 -e Phonons in crystal lattices 05 45 Yv Solitons 63 20 Ry Anharmonic lattice modes |
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