Investigation on dielectric response of PMN ceramics around paraelectric-ferroelectric diffuse phase transition

Autor(es)

Guerra, J. D. S. ^[1] ; Araujo, E. B. ^[2] ; Guarany, C. A. ^[2] ; Lima, E. C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Uberlandia, Inst Fis, Grp Ferroeletr & Mat Multifunc, BR-38400902 Uberlandia, MG - Brazil

^[2] Univ Estadual Paulista, Grp Ferroeletr & Novos Mat, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND TECHNOLOGY; v. 25, n. 11, p. 1316-1320, NOV 2009.
• Citações Web of Science: 0

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. (AU)

• Processo FAPESP: 06/60013-5 - Investigação das propriedades dielétricas lineares e não lineares em materiais ferroelétricos (cerâmicos e filmes finos)
• Beneficiário: José de los Santos Guerra
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 07/00183-7 - Síntese, caracterização e fenomenologia de cerâmicas e filmes nanoestruturados do sistema ferroelétrico PMN-PT
• Beneficiário: Eudes Borges de Araújo
• Modalidade de apoio: Auxílio à Pesquisa - Regular