Nonstoichiometric composition and densification of CaRuO3 by SPS

Nittaya Keawprak; Rong Tu; Takashi Goto

doi:10.4028/0-87849-454-5.251

Nonstoichiometric composition and densification of CaRuO₃ by SPS

Nittaya Keawprak, Rong Tu, Takashi Goto

Materials Processing and Characterization Division

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Calcium ruthenates were prepared in different ratios of Ru to Ca (R _Ru/Ca = 0.5 - 1.4) by spark plasma sintering. CaRuO₃ in a single phase was obtained at R_Ru/Ca = 1.0. At R_Ru/Ca < 1.0, a mixture of CaRuO₃ and CaO was obtained, whereas CaRuO ₃ with second phase of RuO₂ was obtained at R _Ru/Ca > 1.0. The density at R_Ru/Ca < 1.0 were 80-85% and slightly increased with increasing R_Ru/Ca. The density significantly increased up to 95% with increasing R_Ru/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 R_Ru/Ca from 0.7 to 1.0, showing a nonstoichiometric range of Ca_1+δRuO_3+δ.

Original language	English
Pages (from-to)	251-254
Number of pages	4
Journal	Key Engineering Materials
Volume	352
DOIs	https://doi.org/10.4028/0-87849-454-5.251
Publication status	Published - 2007 Jan 1

Keywords

CaRuo
Nonstoichiometry
Spark plasma sintering

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

Access to Document

10.4028/0-87849-454-5.251

Cite this

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title = "Nonstoichiometric composition and densification of CaRuO3 by SPS",

abstract = "Calcium ruthenates were prepared in different ratios of Ru to Ca (R Ru/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 CaRuO 3 with second phase of RuO2 was obtained at R Ru/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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AU - Goto, Takashi

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N2 - Calcium ruthenates were prepared in different ratios of Ru to Ca (R Ru/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 CaRuO 3 with second phase of RuO2 was obtained at R Ru/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.

AB - Calcium ruthenates were prepared in different ratios of Ru to Ca (R Ru/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 CaRuO 3 with second phase of RuO2 was obtained at R Ru/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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