Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/14110
Título: | Orientation-switching transition and ferroelectricity in betaine arsenate |
Autor(es): | Ribeiro, J. L. Dekola, T. Vieira, L. G. |
Palavras-chave: | Phase transitions Dielectric relaxation Vibrational spectroscopy |
Data: | 2009 |
Editora: | IOP Publishing Ltd |
Revista: | Journal of Physics: condensed matter |
Resumo(s): | This paper reports a detailed investigation of the low frequency dielectric relaxation of betaine arsenate near the ferroelectric phase transition. The dielectric relaxation data are complemented with polarized infrared reflectivity data taken at low temperatures. The reported results allow us to identify several low frequency modes that clarify the complex behaviour of the dielectric response near the Curie temperature Tc2 ≈ 120 K. It is suggested that the important slow dynamics observed is linked to the reorientation of the betaine molecular group. The roles of the different molecular units in the structural changes are briefly discussed and a new and more complex phase transition sequence is proposed |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/14110 |
DOI: | 10.1088/0953-8984/21/32/325901 |
ISSN: | 0953-8984 1361-648X |
Versão da editora: | http://dx.doi.org/10.1088/0953-8984/21/32/325901 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - FCD - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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JPCM_21_325901(2009).pdf Acesso restrito! | 668,87 kB | Adobe PDF | Ver/Abrir |