Chapter 51. Microstructure and Ordering Mode of a Protonic Conducting Complex Sr3(Ca1–xNb2–x)O9-δ Perovskite

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Marie-Hélène Berger1 and
  2. Ali Sayir2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291184.ch51

28th International Conference on Advanced Ceramics and Composites A: Ceramic Engineering and Science Proceedings, Volume 25, Issue 3

28th International Conference on Advanced Ceramics and Composites A: Ceramic Engineering and Science Proceedings, Volume 25, Issue 3

How to Cite

Berger, M.-H. and Sayir, A. (2004) Microstructure and Ordering Mode of a Protonic Conducting Complex Sr3(Ca1–xNb2–x)O9-δ Perovskite, in 28th International Conference on Advanced Ceramics and Composites A: Ceramic Engineering and Science Proceedings, Volume 25, Issue 3 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291184.ch51

Author Information

  1. 1

    Ecole des Mines de Paris BP 87 91003 Evry Cedex — FRANCE

  2. 2

    NASA GRC/CWRU 21000 Brookpark Road Cleveland, OH 44135 -USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051498

Online ISBN: 9780470291184

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Keywords:

  • HTPC;
  • SOFC;
  • BSE;
  • SEM;
  • WDX

Summary

Complex perovskites are developed for applications which require high temperature protonic conducting (HTPC) ceramics. the solid-state sintering of the HTPC perovskites leads to limited protonic conductivities possibly due to the grain-boundary blocking effect. A Sr3(Ca1-xNb2-x)O9-δ HTPC perovskite has been produced using the melt growth process with the aim of reducing the grain-boundary blocking effect. Complex perovskite compositions of Sr3Ca1-xNb2-xO9-δ have microstructures characteristic of cellular growth. Each cell has distinct core and shell regions. A composition gradient in bivalent to pentavalent cation ratio is observed from the core to the shell regions. Nano-scaled domains have been revealed inside the cells using high-resolution transmission electron microscope. the domains of 1:1 order of the cations on the B sites and domains of oxygen cage tilting octahedral are explained. the implications of structural and chemical analysis to the protonic conduction characteristic are discussed.