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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1364 (April) (2009)  >  pp.529-533

Journal of the Ceramic Society of Japan
<<Previous article Vol.117  No.1364 (April) (2009)   pp.529 - 533 Next article>>

Oxide ion conductivity in (Ba0.3Sr0.2La0.5)(In1-xMx)O2.75 (M = Sc and Yb) systems

Katsuyoshi KAKINUMA1), Tetsuaki WAKI1), Hiroshi YAMAMURA1) and Tooru ATAKE2)
1) Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University
2) Materials and Structures Laboratory, Tokyo Institute of Technology


  We have investigated the crystal phase and oxide ion conductivity of (Ba0.3Sr0.2La0.5)(In1-xMx)O2.75 (M = Sc and Yb) systems as a function of dopant content and unit cell free volume. All peaks in the XRD diffraction patterns of these systems (x = 0.0 - 0.4) were found to be assignable to pure cubic symmetry. The lattice parameter of the Sc-doped system decreased monotonically with rising dopant content, while the Yb-doped one showed a monotonic increase. The oxide ion conductivity of these systems increased with a unit cell free volume. Above a volume of 2.43 × 10-2 nm3, the oxide ion conductivity decreased. The oxygen vacancy content of the systems was controlled to be constant over the whole compositional range, which suggests that the mobile oxygen content should also be constant over the whole range. Above a free volume of 2.43 × 10-2 nm3, a broad Raman mode emerged from 350 cm-1 to 400 cm-1, which might relate to the local distortion of oxygen octahedra. We conclude that the oxide ion mobility grows with increasing unit cell free volume up to a critical volume, and then the mobility is degraded by the local distortion of the oxygen octahedra.


Keyword:
Oxide ion conductivity, Perovskite oxide, Unit cell free volume

Received: January 22, 2009
Accepted: March 17, 2009 , Published online: April 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan

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