Improved oxide-ion conductivity of NdBaInO4 by Sr doping

Kotaro Fujii; Masahiro Shiraiwa; Yuichi Esaki; Masatomo Yashima; Su Jae Kim; Seongsu Lee

doi:10.1039/C5TA01336D

Improved oxide-ion conductivity of NdBaInO₄ by Sr doping†

Kotaro Fujii,^a Masahiro Shiraiwa,^a Yuichi Esaki,^b Masatomo Yashima,*^a Su Jae Kim^c and Seongsu Lee^c

* Corresponding authors

^a Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo 152-8551, Japan

^b Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo 152-8551, Japan

^c Neutron Science Division, Research Reactor Utilization Department, Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu, Daejeon, Korea

Abstract

The oxide-ion conductivity of NdBaInO₄ has been increased by Sr doping. Nd_0.9Sr_0.1BaInO_3.95 showed the highest electrical conductivity among Nd_1−xSr_xBaInO_4−x/2 (x = 0.0, 0.1, 0.2, and 0.3). The oxide-ion conductivity σ_ion of Nd_0.9Sr_0.1BaInO_3.95 (σ_ion = 7.7 × 10⁻⁴ S cm⁻¹) is about 20 times higher than that of NdBaInO₄ (σ_ion = 3.6 × 10⁻⁵ S cm⁻¹) at 858 °C, and the activation energy of oxide-ion conduction is a little lower for Nd_0.9Sr_0.1BaInO_3.95 (0.795(10) eV) than that for NdBaInO₄ (0.91(4) eV). The structure analysis based on neutron powder diffraction data revealed that the Sr exists at the Nd site and oxygen vacancies are observed in Nd_0.9Sr_0.1BaInO_3.95. This result indicates that the increase of the oxide-ion conductivity is mainly due to the increase of the carrier concentration. The bond valence-based energy landscape indicated two-dimensional oxide-ion diffusion in the (Nd,Sr)₂O₃ unit on the bc-plane and a decrease of the energy barrier by the substitution of Nd with Sr cations.

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DOI: https://doi.org/10.1039/C5TA01336D
Article type: Paper
Submitted: 18 Feb 2015
Accepted: 12 Apr 2015
First published: 20 Apr 2015
This article is Open Access

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J. Mater. Chem. A, 2015,3, 11985-11990

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Improved oxide-ion conductivity of NdBaInO₄ by Sr doping

K. Fujii, M. Shiraiwa, Y. Esaki, M. Yashima, S. J. Kim and S. Lee, J. Mater. Chem. A, 2015, 3, 11985 DOI: 10.1039/C5TA01336D

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Journal of Materials Chemistry A