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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.125  No.4 (April) (2017)  >  pp.227-235

Journal of the Ceramic Society of Japan
<<Previous article Vol.125  No.4 (April) (2017)   pp.227 - 235 Next article>>

Crystal structure, thermal expansion and electrical conduction behavior of PrNi1−xFexO3−δ at high temperature

Kazuhiro KURATA1), Yuichiro TOYOTA1), Tsubasa SATO1), Eiki NIWA2), Katusmi SHOZUGAWA3), Motoyuki MATSUO3), Takuya HASHIMOTO1)
1) Department of Physics, College of Humanities and Sciences, Nihon University 2) Department of Chemistry, School of Science, Tokyo Institute of Technology 3) Department of Multidisciplinary Sciences, Graduate School of Arts and Sciences, The University of Tokyo

In order to evaluate potential of PrNi1−xFexO3−δ as new cathode material for solid oxide fuel cells, single phase preparation, crystal structure at various temperatures, thermal expansion property and electrical conduction behavior at high temperature were investigated. Single phase of PrNi1−xFexO3−δ (0.3 ≤ x ≤ 1.0) with orthorhombic distorted perovskite structure was successfully prepared by Pechini method. No structural phase transition was observed between room temperature and 1000°C in air. Linear thermal expansion coefficient was evaluated to be around 1.16 × 10−5 K−1, showing fair agreement with that of yttria-stabilized zirconia and gadolinia-doped ceria which were frequently employed as electrolyte material. Electrical conductivity of PrNi1−xFexO3−δ increased with increasing Ni content; however, the conductivity did not exceed that of LaNi1−xFexO3−δ. From the comparison of activation energy of variable range hopping conduction and Mössbauer spectroscopy between PrNi1−xFexO3−δ and LaNi1−xFexO3−δ, it was suggested that hole carrier concentration of PrNi1−xFexO3−δ was lower than that of LaNi1−xFexO3−δ owing to variation of valence of Pr ion.


Keyword:
PrNi1−xFexO3−δ, Crystal structure, Thermal expansion, Electrical conductivity, Mössbauer spectroscopy

Received: October 28, 2016
Accepted: January 11, 2017 , Published online: April 03, 2017

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