Oxide Ion Conduction in Solid Solutions Ln1-xSrxCoO3-δ(Ln = La, Pr, Nd)

Хартон, В.В.; Naumovich, E.N.; Vecher, A.A.; Николаев, А. В.

doi:10.1006/jssc.1995.1387

Cited by 109 publications

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“…In this situation, any quantitative comparison is often difficult, even when the experimental data were obtained for essentially similar materials and under identical external conditions. Nonetheless, the data available on ferrite-, cobaltite-, and nickelate-based systems with perovskite-related structures (e.g., [24][25][26][27][28]) seem to confirm that, when longrange ordering in the oxygen sublattices can be neglected, the ionic transport tends to increase with decreasing difference between the host and dopant cation sizes. As an example, Figure 9.3 compares the variations of partial ionic and p-type electronic conductivities in perovskite-type Ln 0.5 A 0.5 FeO 3Àd (A ¼ Sr,Ba) [24].…”

Section: ð9:1þmentioning

confidence: 99%

“…Perovskite-related cobaltites exhibit substantially better transport properties and electrochemical activity in comparison with their ferrite and manganite analogues, but possess also a lower thermodynamic stability and higher thermal and chemical expansion [4,8,27,101,111,136,138,152,156,157,159,168,179]. Due to relatively high mixed conductivity and fast exchange kinetics, significant attention is drawn to the layered cobaltites where the state of Co cations is often more stable with respect to disordered perovskite phases and the TECs are lower; important compositional families are LnBaCo 2 O 5 þ d (Ln ¼ Pr, Gd-Ho, Y), LnBaCo 4 O 7 þ d (Ln ¼ Dy-Yb,Y), and also Ruddlesden-Popper type (Ln,A) 4 Co 3 O 10Àd and (Ln,A) 2 CoO 4AEd (Ln ¼ La-Nd) existing at moderately reduced oxygen pressures (see Refs [179][180][181][182][183][184] and references cited therein).…”

Section: Perovskite-related Mixed Conductors: a Short Overviewmentioning

confidence: 99%

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Oxygen Ion‐Conducting Materials

Хартон

Marques

Kilner

et al. 2009

Solid State Electrochemistry I

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Oxygen ionic and mixed ionic-electronic conductors find important applications in solid-state electrochemical devices, including sensors, solid oxide fuel cells, hightemperature electrolyzers, and oxygen separation membranes. This chapter presents a brief overview of oxide phases with high diffusivity of O 2À anions, providing an introduction to this fascinating topic. Particular emphasis is centered on the comparative analysis of ionic and electronic conductivity variations in the major groups of solid oxide electrolytes and mixed conductors, such as perovskite-and fluorite-related compounds, apatite-type silicates, and derivatives of g-Bi 4 V 2 O 11 and b-La 2 Mo 2 O 9 . The defect chemistry mechanisms relevant to the oxygen ion migration processes are briefly discussed. IntroductionTechnologies based on the use of high-temperature electrochemical cells with oxygen anion-or mixed-conducting ceramics provide important advantages with respect to the conventional industrial processes [1][2][3][4][5][6][7][8]. In particular, solid oxide fuel cells (SOFCs) are considered as alternative electric power generation systems due to high energy-conversion efficiency, fuel flexibility, and environmental safety [1][2][3]. Dense ceramic membranes with mixed oxygen-ionic and electronic conductivity have an infinite theoretical separation factor with respect to oxygen, and can be used for gas separation and the partial oxidation of light hydrocarbons [4,5,7,8] (these and other applications are reviewed in Chapters 12 and 13). For all types of electrochemical cells, the key properties which determine the use of a material are the partial ionic and electronic conductivities. As an example, solid electrolytes for SOFCs, oxygen pumps and electrochemical sensors should exhibit a maximum oxygen ionic conductivity, while the electronic transport should be minimal. In contrast, for SOFC electrodes Solid State Electrochemistry I: Fundamentals, Materials and their Applications. Edited by Vladislav V. Kharton

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Section: ð9:1þmentioning

confidence: 99%

Section: Perovskite-related Mixed Conductors: a Short Overviewmentioning

confidence: 99%

Oxygen Ion‐Conducting Materials

Хартон

Marques

Kilner

et al. 2009

Solid State Electrochemistry I

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“…9 presents a comparison between data on oxygen vacancy diffusion coefficients of different perovskite-type oxides. At small dopant concentrations, the vacancy diffusion coefficient in the perovskites containing variable-valence cations decreases with doping, which is caused probably by strengthening of the B-O Coulombic interaction, due to the formation of M 4 § ions [30,31].…”

Section: Comments On Relationships Between Ionicmentioning

confidence: 98%

Ionic and electronic transport in perovskite-type La(Ga,M)O3−δ (M=Mg, Cr, Fe, Co, Ni, Nb)

Хартон

Naumovich

Marques

1999

Ionics

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ometry, but is lower than for La(Ga,Mg)O3.~ and (La,Sr)GaO3+ Co-doping with Nb and Mg was found to result in decreasing ionic transport in La(Ga,Nb,Mg)O3_s due to blocking of oxygen sites by Nb 5+. Small additions of Fe to the B-site of L%9Sr01GaO3. ~ increase the ionic conductivity, whereas substitution of Cr for Ga has the opposite effect. Incorporation of transition metal cations into the Ga site leads to a higher p-type electronic conductivity in all studied perovskites.

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“…Many different compositions with lanthanides and Sr or Ca on the A-site and with Mn, Fe, Co, Ni on the B-site have been proposed as alternative cathode materials. The oxide ion conductivity increases with Sr concentration [5] and with increasing ionic radius of the rare earth ions [6] on the A-site. Oxide ion diffusion in ferrites/cobaltites is some orders of magnitude higher than in manganites [7,8].…”

Section: Introductionmentioning

confidence: 96%

Temperature programmed oxygen desorption of the perovskites series Ln0.65Sr0.3Mn0.8Co0.2O3 (Ln=La-Gd)

Tietz

Papadelis

Tsiplakides

et al. 2001

Ionics

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Abstract. Temperature programmed 02 desorption (hereafter denoted reduction, TPR) in a high vacuum system equipped with a mass spectrometer was used to investigate the oxygen loss as a function of temperature in perovskites materials of the type Lno.65Sr~3Mn0.sCoo.203 (Ln = Im--Gd), which are important as potential electrode materials for solid oxide fuel cells (SOFC). The materials were prepared either by spray drying as described in [l] or via the Pechini method [2] for the perovskites with Ln = Nd-Gd.The TPR experiments were carried out at temperatures 300-1000 K with various heating rates 13 in order to determine the onset of reduction and the activation energy of reduction for each perovskite. The experiments were carried out in an ultra high vacuum chamber (base pressure 10 t~ mbar after baking) equipped with a quadrupole mass spectrometer [3,4]. Additional oxygen adsorption was attempted at several adsorption temperatures but no discrete oxygen desorption peaks were observed before the onset of reduction. Pro.6sSr0.3Mno.~Coo.203 was tound to have the lowest reduction activation energy (149+19 kJ/mol) and the lowest temperature, TR, for onset of reduction (750 K). On the other hand Gdo.65Sro.3Mno.sCoo.203 was found to have the highest reduction activation energy (232+38 kJ/mol) while the TR was about 850 K. The reduction activation energies follow the sequence Pr

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Oxide Ion Conduction in Solid Solutions Ln1-xSrxCoO3-δ(Ln = La, Pr, Nd)

Cited by 109 publications

References 0 publications

Oxygen Ion‐Conducting Materials

Oxygen Ion‐Conducting Materials

Ionic and electronic transport in perovskite-type La(Ga,M)O3−δ (M=Mg, Cr, Fe, Co, Ni, Nb)

Temperature programmed oxygen desorption of the perovskites series Ln0.65Sr0.3Mn0.8Co0.2O3 (Ln=La-Gd)

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