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Article Dans Une Revue Solid State Ionics Année : 2009

Synthesis of Y-doped BaCeO3 nanopowders by a modified solid-state process and conductivity of dense fine-grained ceramics

Alessio Bassano
  • Fonction : Auteur
Vincenzo Buscaglia
  • Fonction : Auteur
Massimo Viviani
  • Fonction : Auteur
Marta Bassoli
  • Fonction : Auteur
Maria Teresa Buscaglia
  • Fonction : Auteur
Mohamed Sennour
Paolo Nanni
  • Fonction : Auteur

Résumé

Powders of BaYxCe1 − xO3 − δ (x = 0, 0.1 and 0.15) with specific surface area of 6-8 m2g− 1 (BET equivalent particle size of 130-160 nm) were prepared by a modified solid-state route using nanocrystalline BaCO3 and CeO2 raw materials. These powders showed excellent densification at relatively low temperatures. Dense (96-97% relative density) ceramics with submicron grain size (0-4-0.6 µm) were obtained after sintering at 1250-1280 °C. Ceramics sintered at 1450 °C revealed only a moderate grain growth (grain size ≤ 2 µm), uniform microstructure and very high density (≥ 98%). The total conductivity of the submicron ceramics at 600 °C was comparable with the reference values reported in the literature, meaning that the high number of grain boundaries was not a limiting factor. On lowering temperature, the contribution of the blocking grain boundaries becomes progressively more important and the conductivity decreases in comparison to coarse-grained ceramics. Microscopic conductivities of grain interior and grain boundary are the same irrespective of grain size meaning that the different macroscopic behaviour is only determined by a geometric factor (a trivial size effect).

Dates et versions

hal-00367989 , version 1 (13-03-2009)

Identifiants

Citer

Alessio Bassano, Vincenzo Buscaglia, Massimo Viviani, Marta Bassoli, Maria Teresa Buscaglia, et al.. Synthesis of Y-doped BaCeO3 nanopowders by a modified solid-state process and conductivity of dense fine-grained ceramics. Solid State Ionics, 2009, 180, pp.168-174. ⟨10.1016/j.ssi.2008.12.026⟩. ⟨hal-00367989⟩
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