Conductivity and Infrared Absorption of La1−xBaxCoO3Conductive Ceramics

Wang, Chengjian; Xiao, Mingshan; Hu, Jifan; Ling, Chen; Zhang, Chengju; Lan, Jian-sheng; Yu, Hui; Liu, Desheng

doi:10.1006/jssc.1998.7702

Cited by 14 publications

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“…Another divalent ion Ba 2+ has larger ionic radius and it can introduce holes into Co–O bonds as Sr 2+ does. However, there are very few experimental results of magnetic properties of La 1− x Ba x CoO 3 (Barman et al , 1997; Wang et al , 1998; Khalil, 2003; Mandal et al , 2001; Fauth et al , 2001). Despite some structural properties of La 1− x Ba x CoO 3 being reported (Patil et al , 1979; Mandal et al , 2004), the results are still controversial.…”

Section: Introductionmentioning

confidence: 99%

Powder X-ray diffraction and Rietveld analysis of La_1−xBa_xCoO₃ (0<x≤0.5)

Luo

Wang

2006

Powder Diffr.

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Detailed structural properties of La 1−x Ba x CoO 3 ͑LBCO͒ have been investigated by means of X-ray powder diffraction and Rietveld analysis. A structural phase transformation from R3c to Pm3m at x = 0.30-0.35 has been detected based on a comparison between the refinements of R3c and Pm3m. The Co-O bond length of the CoO 6 octahedron expanded rapidly with increasing Ba content when x Ͻ 0.1, and then it leveled off and kept constant at 0.1ഛ x ജ 0.35, where the Co-O-Co bond angle reaches 180°. The Co-O bond length expansion resumed with increasing Ba content beyond x = 0.35.

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Section: Introductionmentioning

confidence: 99%

Powder X-ray diffraction and Rietveld analysis of La_1−xBa_xCoO₃ (0<x≤0.5)

Luo

Wang

2006

Powder Diffr.

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“…Different compositions of the Ln 1−x Ba x CoO 3−␦ ͑Ln = La,Gd,Sm͒ have been examined with respect to the phase stability and magnetic property and some for electrical conductivity. [10][11][12][13][14][15] These studies have examined LBC properties at conditions relevant to its utilization as a ferromagnetic material. Among these materials, LBC is the most stable phase and exhibits the highest electronic conductivity.…”

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confidence: 99%

“…Among these materials, LBC is the most stable phase and exhibits the highest electronic conductivity. 11,12,16 Khalil 11 and Wang et al 12 have measured the total conductivity of LBC over the 20-300°C range and at 30°C, respectively, which are significantly lower than the temperature of interest, i.e., the SOFC operating temperature. The total conductivity reported by Khalil was low ͑Ͻ0.1 S/cm͒, and that reported by Wang et al 12 is 1000 S/cm at 30°C.…”

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confidence: 99%

“…11,12,16 Khalil 11 and Wang et al 12 have measured the total conductivity of LBC over the 20-300°C range and at 30°C, respectively, which are significantly lower than the temperature of interest, i.e., the SOFC operating temperature. The total conductivity reported by Khalil was low ͑Ͻ0.1 S/cm͒, and that reported by Wang et al 12 is 1000 S/cm at 30°C. Ishihara et al 16 determined conductivity as a function of lanthanum content at 800°C ͑248 S/cm for LBC composition͒.…”

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confidence: 99%

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Characterization of La[sub 0.5]Ba[sub 0.5]CoO[sub 3−δ] as a SOFC Cathode Material

Amin

Karan

2010

J. Electrochem. Soc.

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This study reports the physical properties and electrochemical behavior of La 0.5 Ba 0.5 CoO 3−␦ ͑LBC͒, a perovskite material and a potential candidate for the solid oxide fuel cell ͑SOFC͒ cathode. LBC was synthesized by a solid-state route, and phase purity was checked by X-ray diffraction measurement. Thermogravimetric analysis of LBC was performed both in air and in argon atmosphere to observe its phase stability. Total conductivity, measured by a four-point dc polarization method, exhibited a pseudometallic-type behavior. Ionic conductivity was determined in air over a 650-775°C temperature range by a dc polarization technique using electron-blocking electrodes. The high total conductivity, combined with a sufficiently high ionic conductivity ͑1.2 ϫ 10 −3 S/cm at 650°C͒, indicates that LBC possesses a certain degree of mixed ionic-electronic conducting nature. The oxygen reduction behavior of porous LBC electrodes on a gadolinium-doped ceria electrolyte was studied in a symmetrical cell configuration by impedance spectroscopy. The CO 2 tolerance and the high temperature stability of the cell were also investigated. Impedance spectra obtained at zero dc bias conditions consisted of two semicircular arcs, which indicate that the overall oxygen reduction comprises at least two distinct processes. The area specific resistance ͑ASR͒ for electrode polarization was determined over a wide range of temperatures ͑600-850°C͒. The ASR value at 600°C was determined to be 0.16 ⍀ cm 2 , which offers the promise of utilizing LBC as a cathode for low temperature SOFCs.

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“…In order to mitigate the impact of the perovskite addition on the surface area [11] and to avoid any additional sintering during the high temperature activity tests, the catalysts were exposed to prolonged treatment at 850 • C, as in the case of our previously studied series of CexCo catalysts for nitrous oxide decomposition [5]. Lanthanum cobaltate is stable at high temperatures and also known for high conductivity [21][22][23]. Extensive characterization studies, including XPS, XRD, nitrogen physisorption, SEM imaging and Temperature Programmed Oxidation (TPO) measurements, have been performed in order to attempt to explain the impact of LaCoO 3 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Co3O4 and LaCoO3 Interaction by Performing N2O Decomposition Tests under Co3O4-CoO Transition Temperature

et al. 2021

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The research presented in this paper addresses the question: How does the addition of a small amount of LaCoO3 impact the activity of a Co3O4 catalyst? By testing such a catalyst in N2O decomposition under conditions at which the thermal decomposition of Co3O4 to CoO is possible, one gains unique insight into how the two phases interact. The activity of such a catalyst increases in the entire studied temperature range, unlike the activity of the undoped cobalt catalyst which is lower at 850 °C than at 800 °C due to the reduction of Co3O4 to CoO. XRD measurements showed that CoO was also the main cobalt oxide present in the Co3.5La catalyst after operating at 850 °C, as did the XPS measurements, but there was no drop of activity associated with this change. The influence of NO, O2 and H2O on the activity of the new catalyst, Co3.5La, was determined. Lack of positive effect of NO, a known oxygen scavenger, on the activity was noticed at all temperatures, showing that the effect of LaCoO3 is probably due to increased oxygen desorption. Temperature programed oxidation (TPO) tests showed that the beneficial effects of the presence of LaCoO3 on the activity of cobalt oxide at 850 °C were probably caused by enhanced diffusion of O2− anions through the entire catalyst, which facilitates desorption of oxygen molecules from the surface.

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Conductivity and Infrared Absorption of La1−xBaxCoO3Conductive Ceramics

Cited by 14 publications

References 0 publications

Powder X-ray diffraction and Rietveld analysis of La_1−xBa_xCoO₃ (0<x≤0.5)

Powder X-ray diffraction and Rietveld analysis of La_1−xBa_xCoO₃ (0<x≤0.5)

Characterization of La[sub 0.5]Ba[sub 0.5]CoO[sub 3−δ] as a SOFC Cathode Material

Investigation of Co3O4 and LaCoO3 Interaction by Performing N2O Decomposition Tests under Co3O4-CoO Transition Temperature

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Conductivity and Infrared Absorption of La1−xBaxCoO3Conductive Ceramics

Cited by 14 publications

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Powder X-ray diffraction and Rietveld analysis of La1−xBaxCoO3 (0<x≤0.5)

Powder X-ray diffraction and Rietveld analysis of La1−xBaxCoO3 (0<x≤0.5)

Characterization of La[sub 0.5]Ba[sub 0.5]CoO[sub 3−δ] as a SOFC Cathode Material

Investigation of Co3O4 and LaCoO3 Interaction by Performing N2O Decomposition Tests under Co3O4-CoO Transition Temperature

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Powder X-ray diffraction and Rietveld analysis of La_1−xBa_xCoO₃ (0<x≤0.5)

Powder X-ray diffraction and Rietveld analysis of La_1−xBa_xCoO₃ (0<x≤0.5)