Investigation on dielectric response of PMN ceramics around paraelectric-ferroelectric diffuse phase transition
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Data
2009-11-01
Autores
Guerra, J. D. S.
Araujo, E. B. [UNESP]
Guarany, C. A. [UNESP]
Lima, E. C. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Maney Publishing
Resumo
The dielectric properties of relaxor ferroelectric lead magnesium niobate Pb(Mg(1/3)Nb(2/3))O(3) (PMN) ceramics have been investigated. These studies were conducted taking into account the characterisations of the complex dielectric permittivity (real and imaginary parts) as a function of temperature and frequency in a wide interval. on the other hand, the dc 'bias' electrical field dependence of the real dielectric permittivity (C-V characterisations) has been analysed around the paraelectric-ferroelectric diffuse phase transition. Results obtained at room temperature (paraelectric phase) showed a typical behaviour of conventional dielectric materials, while measurements performed at 200 K (ferroelectric phase) evidenced an anomalous behaviour for frequencies up to 100 kHz. Such observed anomalies were characterised by two asymmetrical peaks on sweep-up and sweep-down, at -15 and +18 kV cm(-1) respectively.
Descrição
Palavras-chave
Ferroelectrics, Relaxors, Phase transition, PMN
Como citar
Materials Science and Technology. Leeds: Maney Publishing, v. 25, n. 11, p. 1316-1320, 2009.