Synthesis and characterization of K2NiF4-type CaLnCoO4 (Ln=Sm and Gd)

Taguchi, Hideki; Nakade, Katsuyuki; Hirota, Ken

doi:10.1016/j.materresbull.2006.08.004

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…This structure is adopted by CaSmCoO 4 and CaGdCoO 4 which were studied by Taguchi et al(122) who calculated their global instability indices to be 0.07 and 0.06 vu respectively.…”

Section: Perovskitesmentioning

confidence: 99%

“…Nakade et al( 122 ) reported the structures and other properties of a number of perovskites in the Ca(Mn,Ti)O 3 series. They showed that the global instability index, G , (eq 43 ) increases from 0.02 to 0.10 vu as the manganese content is increased from zero to 70%.…”

Section: Perovskitesmentioning

confidence: 99%

“…The simplest of the layered perovskites is La 2 CuO 4 in which one LaO rock-salt layer alternates with one LaCuO 3 perovskite layer. This structure is adopted by CaSmCoO 4 and CaGdCoO 4 which were studied by Taguchi et al( 122 ) who calculated their global instability indices to be 0.07 and 0.06 vu respectively.…”

Section: Perovskitesmentioning

confidence: 99%

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Recent Developments in the Methods and Applications of the Bond Valence Model

2009

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“…This structure is adopted by CaSmCoO 4 and CaGdCoO 4 which were studied by Taguchi et al(122) who calculated their global instability indices to be 0.07 and 0.06 vu respectively.…”

Section: Perovskitesmentioning

confidence: 99%

Section: Perovskitesmentioning

confidence: 99%

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Recent Developments in the Methods and Applications of the Bond Valence Model

2009

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“…CaCoSmO 4 has been reported in the literature to improve the electrical conductivity (Taguchi et al, 2007); the relationship between the appearance of CaCoSmO 4 and the electrical conductivity will be further explained in the section on Electrical Conductivity Analysis of Layered Perovskite.…”

Section: Resultsmentioning

confidence: 99%

SmBa1-xCaxCo2O5+d Layered Perovskite Cathodes for Intermediate Temperature-operating Solid Oxide Fuel Cells

et al. 2021

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In SmBa1-xCaxCo2O5+d (x = 0.01, 0.03, 0.1, and 0.2, SBCCO) oxide systems calcined at 1100°C for 8 h, the XRD patterns of the SBCCO single phase were maintained in the cases of SmBa0.97Ca0.03Co2O5+d (SBCCO-0.97) and SmBa0.99Ca0.01Co2O5+d (SBCCO-0.99) compositions. In SmBa0.8Ca0.2Co2O5+d (SBCCO-0.8) and SmBa0.9Ca0.1Co2O5+d (SBCCO-0.9), CaCoSmO4 existed with the pattern SBCCO. SBCCO structures were identified as orthorhombic crystal structures because they showed splitting of the X-ray diffraction (XRD) peaks at 23.4°, 47.9°, and 59.1°.Typical metallic conduction behaviors were found in all measured compositions except SBCCO-0.8, which showed a metal-insulator transition (MIT) behavior. Compared to other SmBa1-xCaxCo2O5+d compositions, SBCCO-0.8 showed the highest electrical conductivity of 460 S/cm at 500°C. In particular, SBCCO-0.9 was found to have an excellent ASR characteristic of about 0.077 Ωcm2 at 700°C. The activation energy of SBCCO-0.9 was the lowest among SBCCO oxide systems with a value of 0.77 eV.

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“…gr. Bmab) unit cell [3][4][5][6][7][8][9][10][11][12][13]. Compared with Sr-substituted phases, very little is known about Ca-doped analogues with the K 2 NiF 4 -type structure.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and properties of novel oxide Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-d

et al. 2018

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Sm0.9Ca1.1Fe0.7Co0.3O4-δ oxide with the K2NiF4-type structure was prepared using a glycerin-nitrate technique. The XRD pattern of Sm0.9Ca1.1Fe0.7Co0.3O4-δ was refined by the Rietveld method within an orthorhombic structure (space group Bmab). The electrical conductivity, Seebeck coefficient, and thermal expansion of Sm0.9Ca1.1Fe0.7Co0.3O4-δ were measured depending on temperature in air. The change of oxygen nonstoichiometry determined by TGA in air does not exceed 0.01. The oxygen content in Sm0.9Ca1.1Fe0.7Co0.3O4-δ determined by the reduction in a hydrogen flux is equal to 3.96 ± 0.01. The positive value of Seebeck coefficient indicates that the predominant charge carriers in the oxide studied are electron holes.

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Synthesis and characterization of K2NiF4-type CaLnCoO4 (Ln=Sm and Gd)

Cited by 15 publications

References 25 publications

Recent Developments in the Methods and Applications of the Bond Valence Model

Recent Developments in the Methods and Applications of the Bond Valence Model

SmBa1-xCaxCo2O5+d Layered Perovskite Cathodes for Intermediate Temperature-operating Solid Oxide Fuel Cells

Crystal structure and properties of novel oxide Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-d

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Synthesis and characterization of K2NiF4-type CaLnCoO4 (Ln=Sm and Gd)

Cited by 15 publications

References 25 publications

Recent Developments in the Methods and Applications of the Bond Valence Model

Recent Developments in the Methods and Applications of the Bond Valence Model

SmBa1-xCaxCo2O5+d Layered Perovskite Cathodes for Intermediate Temperature-operating Solid Oxide Fuel Cells

Crystal structure and properties of novel oxide Sm0.9Ca1.1Fe0.7Co0.3O4-d

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Crystal structure and properties of novel oxide Sm_0.9Ca_1.1Fe_0.7Co_0.3O_4-d