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La super(3+)-induced (micro)structural changes and origin of the relaxor-like phase transition in ferroelectric lead barium niobate electroceramics

Venet, Michel ; Zabotto, Fabio L ; Garcia, Jose E ; Ochoa, Diego A ; Garcia, Ducinei ; Eiras, Jose A ; M'Peko, Jean-Claude

Journal of materials science, 2014-07, Vol.49 (14), p.4825-4832 [Periódico revisado por pares]

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  • Título:
    La super(3+)-induced (micro)structural changes and origin of the relaxor-like phase transition in ferroelectric lead barium niobate electroceramics
  • Autor: Venet, Michel ; Zabotto, Fabio L ; Garcia, Jose E ; Ochoa, Diego A ; Garcia, Ducinei ; Eiras, Jose A ; M'Peko, Jean-Claude
  • Assuntos: Ceramics ; Dielectric relaxation ; Diffusion ; Ferroelectric materials ; Ferroelectricity ; Niobates ; Phase boundaries ; Phase transformations
  • É parte de: Journal of materials science, 2014-07, Vol.49 (14), p.4825-4832
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    content type line 23
    ObjectType-Feature-1
  • Descrição: Lead barium niobate (Pb sub(1-x )Ba sub( x )Nb sub(2)O sub(6), PBN) ferroelectric materials have been and are the subject of numerous studies in literature due to their potential for wide-ranging applications in the electronic industry. In this work, La super(3+)-doped Pb sub(0.56)Ba sub(0.44)Nb sub(2)O sub(6) (PBN44) electroceramics were prepared and investigated in terms of X-ray diffraction, scanning electron microscopy, thermal spectra of dielectric permittivity, Curie-Weiss law, and hysteresis loop characteristics. It was noted that La super(3+) doping favors the formation of orthorhombic mm2 phase in PBN44, which originally shows only the tetragonal 4mm symmetry-related phase. In particular, the PBN44 material with 1 wt% La sub(2)O sub(3) displays (micro)structural characteristics and dielectric properties similar to those from PBN compositions lying within their morphotropic phase boundary region. Our results also show that La super(3+) is able to promote a change of the ferroelectric to paraelectric phase transition appearance of PBN44 from pseudo-normal to really diffuse. However, conversion to a diffuse plus relaxor transition behavior reveals directly linked to incommensurate superstructures present and dielectrically-active in PBN materials toward low temperatures, with an intrinsically frequency-dispersive dielectric response. This statement is also supported by observation of hysteresis loops showing a transformation trend to pseudo-slim-like, even in the normal-like ferroelectrics, when moving into the temperature region of incommensuration manifestation.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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