Materials Transactions Online

Materials Transactions, Vol.59 No.01 (2018) pp.14-18
© 2017 The Japan Institute of Metals and Materials

Proton Conduction and Incorporation into La1−xBaxYb0.5In0.5O3−δ

Yuji Okuyama1, Takuya Ymaguchi1, Naoki Matsunaga1 and Go Sakai1

1Department of Environmental Robotics, Faculty of Engineering, University of Miyazaki, Miyazaki 889-2192, Japan

In order to clarify the effect of the dopant concentration and phase transition on the proton conduction and proton concentration, the electrical conductivity and proton concentration were determined for La1−xBaxYb0.5In0.5O3−δ (x = 0.1. 0.3. 0.5, 0.7). The phase transition from the orthorhombic system to the cubic system was over x = 0.3. The proton/deuteron isotope effect on the conductivity was observed for all samples at 673 K. The proton concentration was independent of the barium content above 673 K. The proton concentration increased with the barium content below 673 K, but the concentration ratio of the proton to dopant decreased following an increase in the barium concentration. It was determined that the dopant concentration and phase transition do not have an influence on the conduction and incorporation of protons into the La1−xBaxYb0.5In0.5O3−δ.

[doi:10.2320/matertrans.MB201701]

(Received 2017/05/23; Accepted 2017/06/08; Published 2017/12/25)

Keywords: proton conduction, thermogravimetric analysis, isotope effect

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