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Characterisation of BaZr 0.9 Y 0.1 O 3‐δ Prepared by Three Different Synthesis Methods: Study of the Sinterability and the Conductivity
Author(s) -
Duval S. B. C.,
Holtappels P.,
Vogt U. F.,
Stimming U.,
Graule T.
Publication year - 2009
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200800170
Subject(s) - sintering , materials science , calcination , conductivity , grain size , microstructure , grain boundary , activation energy , analytical chemistry (journal) , electrical resistivity and conductivity , mineralogy , solid solution , metallurgy , chemistry , catalysis , chromatography , biochemistry , electrical engineering , engineering
BaZr 0.9 Y 0.1 O 3‐δ has been synthesised by three different methods: the solid‐state reaction, the spray pyrolysis and the spray drying. Significantly different apparent lattice parameters (between 0.4192 nm for the sample prepared by the solid‐state reaction method and sintered at 1,500 °C and 0.4206 nm for the sample prepared by the solid‐state reaction method and sintered at 1,720 °C) are observed after calcination and sintering, depending on the synthesis method and the sintering temperature. The bulk conductivity values also vary over several orders of magnitude (–7.2< log σ b <–3.6 at 300 °C) depending on the synthesis method and the sintering temperature. These variations of the bulk conductivity and also the activation energy are correlated with variations of the apparent lattice parameter. The influence of the preparation method on the electrical properties is discussed. The grain boundaries are more resistive than the bulk. The variation of the grain boundary conductivity could be correlated to the microstructure in terms of the grain size.