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Induced displacive transition in heterogeneous materials

Published online by Cambridge University Press:  11 July 2012

M. Apostol ,
S. Ilie ,
A. Petrut ,
M. Savu  and
S. Toba
M. Apostol*
Affiliation:
Department of Theoretical Physics, Institute of Atomic Physics, Magurele-Bucharest MG-6, PO Box MG-35, Romania MIRA Technologies Ltd., Teiul Doamnei 2, Bucharest, Romania
S. Ilie
Affiliation:
MIRA Technologies Ltd., Teiul Doamnei 2, Bucharest, Romania MIRA Telecom, Grigorescu 13, 075100 Otopeni, Bucharest, Romania
A. Petrut
Affiliation:
MIRA Telecom, Grigorescu 13, 075100 Otopeni, Bucharest, Romania
M. Savu
Affiliation:
MIRA Technologies Ltd., Teiul Doamnei 2, Bucharest, Romania
S. Toba
Affiliation:
MIRA Telecom, Grigorescu 13, 075100 Otopeni, Bucharest, Romania
*
ae-mail: apoma@theory.nipne.ro

Abstract

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A model of heterogeneous, composite material is introduced, consisting of randomly distributed identical structural micro-domains endowed with electric charges or dipoles. Two cases are presented, one corresponding to a tightly packed (dense) material, another corresponding to highly-dispersed, small domains. The polarizability is computed in both cases, under the action of an external uniform electric field oscillating in time (a quasi-stationary field), and it is related to the displacement of the micro-domains from their positions of local equilibrium (translations or rotations). It is shown that the polarizability (or electric susceptibility) can exhibit characteristic (resonance) frequencies in the radio-frequency range and, even for moderate external fields, the material can undergo a displacive transition (similar to a ferroelectric transition), governed by non-linearities in the interaction energy of the micro-domains. The shift in the characteristic frequencies of the polarizability is estimated, as caused by the displacive modification.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 59 , Issue 1 , July 2012 , 10401
Copyright
© The Author(s), 2012

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