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Ferroelectrics Volume 302, 2004 - Issue 1
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Original Articles

Anisotropic Effects of Bromine Substitution in Betaine Calcium Chloride Dihydrate

L. G. VIEIRA Departamento de Física Universidade do Minho, Braga, Portugal, 4710-057
,
J. L. RIBEIRO Departamento de Física Universidade do Minho, Braga, Portugal, 4710-057
,
M. R. CHAVES Departamento de Física Faculdade de Ciências da Universidade do Porto Rua do Campo, Alegre 687, Porto, Portugal, 4169-007
,
A. ALMEIDA Departamento de Física Faculdade de Ciências da Universidade do Porto Rua do Campo, Alegre 687, Porto, Portugal, 4169-007
,
O. HERNANDEZ LCSIM, UMR 6511 CNRS-Université de Rennes 1 Institut de Chimie de Rennes, Bât., 10B Campus de Beaulieu, Avenue du Général Leclerc, Rennes, France, 35042
,
M. QUILICHINI Laboratoire Léon Brillouin CEA/Saclay, 91191 Gif-sur-Yvette CEDEX, France
&
A. KLÖPPERPIEPER Fachbereich Physik Universität des Saarlandes, Saarbrücken, Germany, 66041
 show all
Pages 151-153 | Received 01 Aug 2003, Accepted 01 Jan 2004, Published online: 08 Sep 2010
 
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Abstract

The effects of partial substitution of chlorine by bromine in incommensurate betaine calcium chloride di-hydrate (BCCD) have been investigated by FTIR reflectivity and elastic neutron scattering. Bromine distorts the H-bonds linking the Ca complexes and induces local symmetry breaking. The temperature dependence of b and c lattice parameters of the 4% and 8% brominated compounds reveals that this distortion has effects that are markedly anisotropic. This anisotropy may help to clarify why bromine progressively destabilizes the low temperature phases of BCCD.

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