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Ferroelectrics Volume 302, 2004 - Issue 1
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Original Articles

Ferroelectric Phase in Betaine Phosphite Studied by Raman Scattering

M. L. SANTOS Departamento de Física da Faculdade de Ciências da Universidade do Porto IFIMUP, Rua do Campo, Alegre 687, Porto, Portugal, 4169-007
,
J. AGOSTINHO MOREIRA Departamento de Física da Faculdade de Ciências da Universidade do Porto IFIMUP, Rua do Campo, Alegre 687, Porto, Portugal, 4169-007
,
A. ALMEIDA Departamento de Física da Faculdade de Ciências da Universidade do Porto IFIMUP, Rua do Campo, Alegre 687, Porto, Portugal, 4169-007
,
M. R. CHAVES Departamento de Física da Faculdade de Ciências da Universidade do Porto IFIMUP, Rua do Campo, Alegre 687, Porto, Portugal, 4169-007
&
A. KLÖPPERPIEPER Fachbereich Physik Universität der Saarlandes, Saarbrücken, Germany, 66041
Pages 133-136 | Received 01 Aug 2003, Accepted 01 Jan 2004, Published online: 08 Sep 2010
 
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Abstract

In this work we present a detailed study of the temperature dependence (35 K – 290 K) of the Raman spectra in a single crystal of betaine phosphite. A softening of a relaxational mode is observed above and below the para-ferroelectric phase transition at Tc2∼ 213 K, which appears to have its primary origin in the different internal dynamic deformations and reorientations of molecular units. Our results suggest the existence of a certain degree of local disorder between 110 K and 170 K.

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