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Nonstoichiometric Composition and Densification of CaRuO3 by SPS

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Abstract:

Calcium ruthenates were prepared in different ratios of Ru to Ca (RRu/Ca = 0.5～1.4) by spark plasma sintering. CaRuO3 in a single phase was obtained at RRu/Ca = 1.0. At RRu/Ca < 1.0, a mixture of CaRuO3 and CaO was obtained, whereas CaRuO3 with second phase of RuO2 was obtained at RRu/Ca > 1.0. The density at RRu/Ca < 1.0 were 80-85% and slightly increased with increasing RRu/Ca. The density significantly increased up to 95% with increasing RRu/Ca from 1.1 to 1.4, suggesting that the second phase of RuO2 was effective to densify CaRuO3. The density of CaRuO3 in a single phase was 82% at most. The lattice parameters of CaRuO3 decreased with increasing RRu/Ca from 0.7 to 1.0, showing a nonstoichiometric range of Ca1+δRuO3+δ.

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Periodical:

Key Engineering Materials (Volume 352)

Pages:

251-254

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.352.251

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Online since:

August 2007

Authors:

Nittaya Keawprak, Rong Tu, Takashi Goto

Keywords:

CaRuO3, Nonstoichiometry, Spark Plasma Sintering (SPS)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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