CO gas sensitivities of reduced perovskite oxide LaCoO3 − x

Arakawa, Tsuyoshi; Takada, Ken; Tsunemine, Yoshikazu; Shiokawa, Jiro

doi:10.1016/0250-6874(88)80068-4

Cited by 39 publications

(6 citation statements)

References 11 publications

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“…Polymetallic oxides, such as the perovskite-type LnMO 3 (Ln, lanthanoids, M, tri-valent cations) [1,2] and ferrite-type MFe 2 O 4 (M, di-valent cations) materials [3][4][5][6][7][8][9][10], have been investigated for many useful applications. The most conventional method for the preparation of these polymetallic oxides is the solid-state reaction of oxide materials.…”

Section: Introductionmentioning

confidence: 99%

Surface study of fine MgFe2O4 ferrite powder prepared by chemical methods

Aono

Hirazawa

Naohara

et al. 2008

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Surface study of fine MgFe2O4 ferrite powder prepared by chemical methods

Aono

Hirazawa

Naohara

et al. 2008

Applied Surface Science

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“…P EROVSKITE-TYPE LnTO 3 (Ln ϭ lanthanoid, T ϭ transition element) heterometallic oxides have been widely investigated for their functional electrical properties and used in many applications, such as for catalysts, 1 fuel cells, 2 and gas sensors. [3][4][5][6][7][8][9][10][11] Perovskite-type oxide powders with a controlled stoichiometry and microstructure are needed for these applications. The most conventional method for preparing these heterometallic oxides is by the solid-state reaction of Ln 2 O 3 and T 2 O 3 single oxides.…”

Section: Introductionmentioning

confidence: 99%

Design of Ceramic Materials for Chemical Sensors: Effect of SmFeO₃ Processing on Surface and Electrical Properties

Aono

Satō

Traversa

et al. 2001

Journal of the American Ceramic Society

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Perovskite-type SmFeO 3 powders were prepared by the thermal decomposition of a heteronuclear complex, Sm(Fe(CN) 6 )⅐ 4H 2 O and by solid-state reaction between the corresponding single oxides, Sm 2 O 3 and Fe 2 O 3 . The thermal decomposition behavior of the complex was studied by thermogravimetric analysis. X-ray diffractometry was used to investigate the structure of the products from the complex thermal decomposition and the formation of SmFeO 3 from the oxide mixture. Powders prepared by both methods were used to deposit thick films onto alumina substrates with comb-type gold electrodes. The microstructure and chemical homogeneity of the film surfaces were investigated by scanning electron microscopy and Auger electron spectroscopy. Thick SmFeO 3 single-phase films having a homogeneous elemental distribution on the surface were obtained when powder prepared by thermal decomposition of the complex was used for deposition, even when the powder was fired at low temperature (800°C). Surface chemical analysis was performed by X-ray photoelectron spectroscopy (XPS). The O 1s XPS line was deconvoluted into two peaks, attributed to adsorbed oxygen (O ad ) and oxygen in the lattice (O lattice ). Quantitative analysis showed that the surface coverage of iron, expressed as Fe/(Fe ؉ Sm), was larger for the films prepared using the solid-state reacted powder. Although the O lattice /(Fe ؉ Sm) atomic ratio was not influenced by the processing procedures (and, thus, by iron surface coverage), the amount of O ad decreased with increasing iron surface coverage. A model of the SmFeO 3 surface was used to determine that the outermost layer of the perovskitetype SmFeO 3 prepared from the complex consisted mainly of samarium ions that could each bond four adsorbed oxygen ions. A single oxygen ion could adsorb onto an iron ion, and therefore, the content of adsorbed oxygen was lower for the film prepared from the solid-state reacted powders, which showed larger iron surface coverage. Electrical conductance measurements, performed with increasing temperature in different gaseous environments, confirmed these findings. Higher conductances and lower activation energies were observed for the films with larger samarium surface coverage.

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“…Up to date, the perovskite-type oxides have been reported to exhibit high catalytic activity for oxidations of hydrocarbon [1,2] and chlorinated volatile organic compounds [3], and decomposition of NO [4][5][6]. In addition, the perovskite-type oxides have been widely investigated to be employed as electrode materials [7][8][9][10] and sensing materials [11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Self-propagating high-temperature synthesis of LaMO3 perovskite-type oxide using heteronuclearcyano metal complex precursors

Sánchez-Rodríguez

Wada

Yamaguchi

et al. 2015

Journal of Alloys and Compounds

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The decomposition of La[Fe(CN) 6 ] and La [Co(CN) 6 ] under different atmospheres has been analyzed by thermogravimetry (TG) and differential thermal analysis (DTA). In addition, the decomposition temperature at different sample locations was monitored for sample masses around 2 g of La[Fe(CN) 6 ] and La[Co(CN) 6 ], when they were calcined for 1 h at temperatures ranging from 200 to 400 ºC in a controlled gas-flow system.Results showed that, for sample large enough of these cyano complex precursors undergo combustion when are decomposed under oxygen atmosphere. X-ray diffraction 2 revealed that perovskite-type oxides crystallize due to the overheating of the process. As a result, it has been possible to produce LaFeO 3 and LaCoO 3 perovskite-type oxide powders by SHS under oxygen atmosphere using La[Fe(CN) 6 ] and La[Co(CN) 6 ] as a precursor. The effect of the ignition temperature has been investigated. The specific surface area of the perovskite-type oxides produced via SHS using heteronuclearcyano metal complex as a precursor is significantly higher than that of other LaMO 3 produced using the same technique but obtained from other type of precursors.

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CO gas sensitivities of reduced perovskite oxide LaCoO3 − x

Cited by 39 publications

References 11 publications

Surface study of fine MgFe2O4 ferrite powder prepared by chemical methods

Surface study of fine MgFe2O4 ferrite powder prepared by chemical methods

Design of Ceramic Materials for Chemical Sensors: Effect of SmFeO₃ Processing on Surface and Electrical Properties

Self-propagating high-temperature synthesis of LaMO3 perovskite-type oxide using heteronuclearcyano metal complex precursors

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CO gas sensitivities of reduced perovskite oxide LaCoO3 − x

Cited by 39 publications

References 11 publications

Surface study of fine MgFe2O4 ferrite powder prepared by chemical methods

Surface study of fine MgFe2O4 ferrite powder prepared by chemical methods

Design of Ceramic Materials for Chemical Sensors: Effect of SmFeO3 Processing on Surface and Electrical Properties

Self-propagating high-temperature synthesis of LaMO3 perovskite-type oxide using heteronuclearcyano metal complex precursors

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Design of Ceramic Materials for Chemical Sensors: Effect of SmFeO₃ Processing on Surface and Electrical Properties