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Microstructural, structural and dielectric properties of Er3+-modified BaTi0.85Zr0.15O3 ceramics

Antonelli, E ; Letonturier, M ; M'Peko, J-C ; Hernandes, A C

Journal of the European Ceramic Society, 2009-05, Vol.29 (8), p.1449-1455 [Periódico revisado por pares]

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Título:
Microstructural, structural and dielectric properties of Er3+-modified BaTi0.85Zr0.15O3 ceramics
Autor: Antonelli, E ; Letonturier, M ; M'Peko, J-C ; Hernandes, A C
É parte de: Journal of the European Ceramic Society, 2009-05, Vol.29 (8), p.1449-1455
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: The (micro)structural and electrical properties of undoped and Er3+-doped BaTi0.85Zr0.15O3 ceramics were studied for both nominal Ba2+ and Ti4+ substitution formulations. The ceramics were produced by a solid-state reaction and sintered at 1400 C for 3 h. Those materials prepared following the donor-type nominal Ba1-xErx(Ti0.85Zr0.15)O3 composition, especially Er3+, showed a preferential substitution for the (Ti,Zr)4+ lattice sites. This allowed synthesis of a finally acceptor-like, highly resistive Ba(Ti,Zr,Er)O3-delta-like system, with a solubility limit below but close to 3 cat% Er3+. The overall phase development is discussed in terms of the amphoteric nature of Er3+, and appears to mainly or, at least, partially also involve a minimisation of stress effects from the ion size mismatch between the dopant and host cations. Further results include a comparative analysis of the behaviour of the materials' grain size, electrical properties and nature of the ferroelectric-to-paraelectric phase transition upon variation of the formulation and Er3+ content.
Idioma: Inglês

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