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Phase Relations and Conductivity in Ba2 (In2. xMx)O5, System

Published online by Cambridge University Press:  10 February 2011

Akihiko Yamaji ,
Kazuya Kawakami ,
Masahiro Arai  and
Tadaharu Adachi
Akihiko Yamaji
Affiliation:
Department of Mechanical Enginerring, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo 152, Japan
Kazuya Kawakami
Affiliation:
Department of Mechanical Enginerring, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo 152, Japan
Masahiro Arai
Affiliation:
Department of Mechanical Enginerring, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo 152, Japan
Tadaharu Adachi
Affiliation:
Department of Mechanical Enginerring, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo 152, Japan
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Abstract

The high temperature cubic phase of Ba2 nr2O5 shows large ion conductivity. It is interestingto examine, if the cubic phase can be stabilized in the low temperature region (920 C) by making solid solution of another element. In the present study, we investigated the ion conductivity and the crystal structure of Ba2(In2-x.Mx)O5 system by substituting In site for element M such as Sc, Y, La, Ce, Nb, Ta etc. By substituting 3 mole % Nb for In, the transition temperature decreased by about 300 C. High temperature X-ray diffraction analysis shows the crystal structure changes from orthorhombic to cubic at this transition temperature. The effective elements which decreased the transition temperature were pentavalent or tetra valent elements such as Nb or Si ,Ce. The substitution In site for 20 mole percentage Nb stabilizes the cubic structure down to room temperature. Considering the transport number, the tetravalent element doping is very effective to stabilize the cubic phase of Ba2In2O5 without lose of excellent characteristic of pure Ba2ln2O5.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 343
Copyright
Copyright © Materials Research Society 2000

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References

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