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Synthesis and Na+ conduction properties of the ceramics of Na5YSi4O12-type phosphate-substituted solid solutions

Published online by Cambridge University Press:  31 January 2011

Kimihiro Yamashita ,
Motohide Matsuda  and
Takao Umegaki
Kimihiro Yamashita
Affiliation:
Division of Inorganic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, 2–3-10 Kanda-Surugadai, Chiyoda, Tokyo 101, Japan
Motohide Matsuda
Affiliation:
Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 2–1-1 Tsushima-Naka, Okayama 700, Japan
Takao Umegaki
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University,1–1 Minami-Osawa, Hachioji, Tokyo 192–03, Japan
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Abstract

The Na+-superionic conducting ceramics with Na5YSi4O12-type structure were synthesized using the composition formula of Na3+3x−yY1-xPySi3-yO9, in which some portions of Na+ ions are considered to replace Y3+as Na(13+8x−4y/3) [Na(4x−1)/3Y(4–4x)/3] [P4y/3Si(12–4y)/3]O12 according to Na5YSi4O12-type composition formula. The average ionic radius of the 6-coordinated Y3+ sites [= (4x − 1)/ 3 ×rNa + (4 - 4x)/3 × rY] approximately covered the range of rGd and to rSm. The ionic conduction properties were strongly dependent upon the combination of composition parameters, x and y. In this report, the dependence of conduction properties on the composition is discussed on the basis of structural considerations.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 12 , December 1998 , pp. 3361 - 3364
Copyright
Copyright © Materials Research Society 1998

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