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New ferroelectric: Bis-thiourea pyridinium bromide inclusion compound

Published online by Cambridge University Press:  28 September 2012

Piotr Czarnecki ,
Aleksandra Pajzderska ,
Eric Collet ,
Loic Toupet  and
Jan Wąsicki
Piotr Czarnecki
Affiliation:
Faculty of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland
Aleksandra Pajzderska
Affiliation:
Faculty of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland
Eric Collet
Affiliation:
Université de Rennes 1, Institut de Physique de Rennes, UMR UR1-CNRS 6251, F-35000 Rennes, France
Loic Toupet
Affiliation:
Université de Rennes 1, Institut de Physique de Rennes, UMR UR1-CNRS 6251, F-35000 Rennes, France
Jan Wąsicki*
Affiliation:
Faculty of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland
*
a)Address all correspondence to this author. e-mail: jwasicki@amu.edu.pl
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Abstract

Dielectric measurements (permittivity and hysteresis loop) of monocrystals of bis-thiourea pyridinium bromide inclusion compound have revealed for the first time ferroelectric properties of the studied samples. In the present article, a model of ferroelectric ordering on the basis of single-crystal x-ray diffraction data is described. In the low-temperature phase, the spontaneous polarization is directed along the a axis and ferroelectricity is of the mixed type (displacement and order-disorder component), whereas in the intermediate phase the spontaneous polarization is directed along the c axis and ferroelectricity is of the order-disorder type.

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Articles
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Journal of Materials Research , Volume 27 , Issue 22 , 22 November 2012 , pp. 2844 - 2850
Copyright
Copyright © Materials Research Society 2012

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References

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