Preparation and properties of La1−xCaxCoO3 (0,2 ≤ x ≤ 0,6)

Kononyuk, I.F.; Tolochko, S.P.; Lutsko, V.; Анищик, В. М.

doi:10.1016/0022-4596(83)90076-2

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…Successful use of any material in the wide range of temperature and pressure require detailed knowledge of the stability boundaries of the phases and the phase equilibria. However, a number of papers concerning the synthesis procedure, crystal and electronic structure, catalytic activity and magnetic properties [1][2][3][4][5][6][7][8] do not give much information about phase equilibria and stability ranges of the single phases in the systems. Such phase equilibria data are usually given by the appropriate phase diagrams.…”

Section: Introductionmentioning

confidence: 99%

Phase equilibria in the La-Me-Co-O (Me=Ca, Sr, Ba) systems

Черепанов¹,

Gavrilova²,

Barkhatova³

et al. 1998

Ionics

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Abstract. The phase equilibria of the La-Me-Co-O systems (Me = Ca, Sr and Ba) were studied in air at 1100 ~ Two types of solid solution of general composition LavxMexCoO~_8 and (Lal.y Mey)2CoO 4 were found to exist in the systems. The limiting composition of Lal_xMexCoO3 ~ lies at x = 0.8 for Me = Sr, Ba and between 0.3-0.5 for Me = Ca. It is shown that the rhombohedral distortion of the perovskite type Lal_xMe• decreases while x increases. Lal_xMexCoO3_~ (Me = Sr, Ba) shows an ideal cubic structure at x -0.5. The stability range of (La1_yMey)2CoO 4 was found to be 0.25 < y < 0.35 for Me = Ca, 0.3 _ log(Po2) > -2.25 can be written as follows: Lal_ x, Sr• ~, = n Lal_x,,Srx,,CoO3_5,, + m SrCoO2.5 + q/2 O: where x' > x". The decomposition mechanism of Lal_xSrx CoO3_~ for the samples with x < 0.5 within the oxygen pressure range -2.25 > log(Po2) > -3.55 changes and can be written as follows: Lal_xSr• ~, = r Lax_x,Srx,COO3_5,, + w (Lal_y,Sry,)2CoO 4 + v CoO + f/2 02. The results are shown in "logPo2-composition" diagrams.

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Section: Introductionmentioning

confidence: 99%

Phase equilibria in the La-Me-Co-O (Me=Ca, Sr, Ba) systems

Черепанов¹,

Gavrilova²,

Barkhatova³

et al. 1998

Ionics

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“…Mixed ionic and electronic conducting perovskites (LSCo) receive wide attention to date because of their potential applications as gas-separation membranes, oxidation catalysts, and as electrodes in solid-oxide fuel cells. [2][3][4][5][6][7][8][9] Fuel cells with LaCoO 3 air electrodes, with and without Srdoping, had been proposed for cathodes in high-temperature zirconia fuel cells many years ago. [10][11][12] These materials possess high ionic conductivity at elevated temperatures due to a large oxygen vacancy concentration in conjunction with a high vacancy diffusivity even in an oxidizing atmosphere.…”

mentioning

confidence: 99%

Solid Oxide Fuel Cells with Doped Lanthanum Gallate Electrolyte and LaSrCoO3 Cathode, and Ni‐Samaria‐Doped Ceria Cermet Anode

Marić

Ohara

Fukui

et al. 1999

J. Electrochem. Soc.

124

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The electrode performance of a single solid‐fuel cell (SOFC) was evaluated using a 500 μm thick La0.9Sr0.1Ga0.8Mg0.2O0.3 (LSGM) as the electrolyte membrane. A doped lanthanum cobaltite, La0.6Sr0.4CoO3−δ was selected as the cathode material, and a samaria‐doped ceria‐NiO composite powder was used as the anode material. The spray‐pyrolysis method was applied for synthesis of the starting powders of the cathode and anode. In this study, different microstructures of the cathode were obtained by varying the sintering temperature from 950 to 1200°C. High power density (the maximum power density of the cell was about 425 normalmW/cm2 , which is 95% of the theoretical value) of the solid oxide fuel cell at 800°C was achieved. The cell performance showed that, with a proper choice of electrode materials with optimized microstructure and LSGM as the electrolyte, a SOFC operating at temperatures Tnormalop≤800 is a realistic goal. © 1999 The Electrochemical Society. All rights reserved.

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“…3), consistent with the hole doping approach [26]. As to the dominating scattering mechanism, today many researchers believe that we have a polaron-modified semiconducting TEP in the thermally activated insulating region above T c , which basically drops to a constant value with increasing temperature [27].…”

Section: Thermoelectric Powermentioning

confidence: 59%