TY - JOUR
T1 - Crystal structure, thermal expansion and electrical conduction behavior of PrNi1-xFexO3-δ at high temperature
AU - Kurata, Kazuhiro
AU - Toyota, Yuichiro
AU - Sato, Tsubasa
AU - Niwa, Eiki
AU - Shozugawa, Katusmi
AU - Matsuo, Motoyuki
AU - Hashimoto, Takuya
N1 - Publisher Copyright:
© 2017 The Ceramic Society of Japan.
PY - 2017/4
Y1 - 2017/4
N2 - 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 × 10-5K-1, showing fair agreement with that of yttriastabilized 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.
AB - 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 × 10-5K-1, showing fair agreement with that of yttriastabilized 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.
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U2 - 10.2109/jcersj2.16241
DO - 10.2109/jcersj2.16241
M3 - Article
AN - SCOPUS:85017117998
VL - 125
SP - 227
EP - 235
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
SN - 1882-0743
IS - 4
ER -