Structural and dielectric properties of relaxor Sr0.5Ba0.5Bi2Nb2O9 ceramic

Autor(es)

Behera, B. ^[1] ; Araujo, E. B. ^[1] ; Junior, A. F. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP - Brazil

^[2] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Advances in Applied Ceramics; v. 109, n. 1, p. 1-5, JAN 2010.
• Citações Web of Science: 6

Resumo

Sr(0.5)Ba(0.5)Bi(2)Nb(2)O(9) ceramic was prepared by a conventional solid state reaction method and studied using X-ray powder diffraction and dielectric measurements. At room temperature, an orthorhombic structure was confirmed and their parameters were obtained using the Rietveld method. Dielectric properties were studied in a broad range of temperatures and frequencies. Typical relaxor behaviour was observed with strong dispersion of the complex relative dielectric permittivity. The temperature of the maximum dielectric constant T(m) decreases with increasing frequency, and shifts towards higher temperature side. The activation energy E(a) approximate to 0.194 +/- 0.003 eV and freezing temperature T(f) approximate to 371 +/- 2 K values were found using the Vogel-Fulcher relationship. Conduction process in the material may be due to the hopping of charge carriers at low temperatures and small polarons and/or singly ionised oxygen vacancies at higher temperatures. (AU)

• Processo FAPESP: 07/05302-4 - Estudos das propriedades estruturais, dielétricas e elétricas da solução sólida do sistema ferroelétrico PMN-PT
• Beneficiário: Banarji Behera
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 07/00183-7 - Síntese, caracterização e fenomenologia de cerâmicas e filmes nanoestruturados do sistema ferroelétrico PMN-PT
• Beneficiário: Eudes Borges de Araújo
• Linha de fomento: Auxílio à Pesquisa - Regular