High temperature electrical properties of the perovskite-type oxide La1 − xSrxMnO3 − d

Kamata, Hiroyuki; Yonemura, Yuki; Mizusaki, Junichiro; Tagawa, Hiroaki; Naraya, Kazunori; Sasamoto, Tadashi

doi:10.1016/0022-3697(95)00019-4

Cited by 73 publications

(52 citation statements)

References 19 publications

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“…The increase of the electrical conductivity with increasing temperature reflects the enhancement of the concentration of free electrons, holes and tetravalent Fe ions. This behavior is similar to that observed in Al-doped SrFeO 3 [38,39] [40], and BaFe 1-x Ta x O 3-δ [41]. Nevertheless, it should be pointed out that the electrical conductivity of the polycrystalline BaFe 1−x Al x O 3−δ phase shows similar tendency compared to our previous theoretical results [42].…”

Section: Electrical Conductivity Measurementssupporting

confidence: 89%

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Hanane¹,

Omari²

2016

ChChT

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Abstract. In this study, BaFe 1−x Al x O 3-δ (0 ≤ x ≤ 0.3) perovskite-type oxides were prepared by sol-gel method using citric acid as chelating agent. The samples were subjected to various calcination temperatures in order to investigate the physicochemical properties of the oxide affected by the parameter. Thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray diffraction (XRD) techniques are used to explore precursor decomposition and to establish adequate calcination temperature for the preparation of the nanopowders. The studied compounds have hexagonal crystal structure at the temperature of 1123 K. The samples obtained after calcination at 1123 K were characterized by XRD, Brunauer-Emmett-Teller surface area analysis, scanning electron microscopy, powder size distribution and electrical conductivity. The microstructure and morphology of the compounds show that the particles are nearly spherical in shape and are partially agglomerated. The highest surface area and total pore volume are achieved for BaFe 0.8 Al 0.2 O 3-δ oxide. Temperature dependence of electrical conductivity shows a semiconducting behavior.

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Section: Electrical Conductivity Measurementssupporting

confidence: 89%

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Hanane¹,

Omari²

2016

ChChT

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“…Defect models for LSM may still be considered somewhat incomplete for this reason. Given the high electronic transference numbers of both materials, electronic measurements such as the fourpoint probe and thermoelectricity create greater confidence in electronic structure and transport models, which generally depict a hopping mechanism involving e g and t 2g energy levels of the Mn ion in LSM [34,37,38], and a band conduction model for LSCF.…”

Section: General Knowledgementioning

confidence: 99%

Continuum and Quantum-Chemical Modeling of Oxygen Reduction on the Cathode in a Solid Oxide Fuel Cell

et al. 2007

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Solid oxide fuel cells (SOFCs) have several advantages over other types of fuels cells such as highenergy efficiency and excellent fuel flexibility. To be economically competitive, however, new materials with extraordinary transport and catalytic properties must be developed to dramatically improve the performance while reducing the cost. This article reviews recent advancements in understanding oxygen reduction on various cathode materials using phenomenological and quantum chemical approaches in order to develop novel cathode materials with high catalytic activity toward oxygen reduction. We summarize a variety of results relevant to understanding the interactions between O 2 and cathode materials at the molecular level as predicted using quantum-chemical calculations and probed using in situ surface vibrational spectroscopy. It is hoped that this in-depth understanding may provide useful insights into the design of novel cathode materials for a new generation of SOFCs.

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“…Unfortunately, so far little is known on the conduction model for St-doped LaMnO3 (LSM) and LSC. Kamata et al [11] postulate that transport in LaMnO 3 occurs according to a multi-level hopping, however, they did not develop the details of this conductivity mechanism. Their model is based on an assumption that the charge transport occurs according to jumps of electron holes (Mn 4+ ---> Mn3+).…”

Section: Electrical Propertiesmentioning

confidence: 95%

“…These jumps may be considered as an electron transfer between t32ge~ of Mn 4+ ions and t32gelg or t42ge~ of Mn 3+ ions. Accordingly, the electrical conductivity may be expressed by the following expression [11]:…”

Section: Electrical Propertiesmentioning

confidence: 99%

Defect chemistry and electrical properties of La1−xSrxCoO3−δ IV. Electrical properties

Бак

Nowotny

Rękas

et al. 2001

Ionics

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High temperature electrical properties of the perovskite-type oxide La1 − xSrxMnO3 − d

Cited by 73 publications

References 19 publications

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Synthesis, Structural and Physicochemical Characterization of BaFe1-xAlxO3−δ Oxides

Continuum and Quantum-Chemical Modeling of Oxygen Reduction on the Cathode in a Solid Oxide Fuel Cell

Defect chemistry and electrical properties of La1−xSrxCoO3−δ IV. Electrical properties

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