Sol–gel synthesis, X-ray photoelectron spectroscopy and electrical conductivity of Co-doped (La, Sr)(Ga, Mg)O3− perovskites

Polini, Riccardo; Falsetti, Alessia; Traversa, Enrico; Schäf, O.; Knauth, Philippe

doi:10.1016/j.jeurceramsoc.2007.02.147

Cited by 63 publications

(29 citation statements)

References 30 publications

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“…The peak of Sr 3d (a) at 130.8 eV was observed only for STF 1 which can be attributed to the Sr ions surrounded by vacancies in the oxygen-deficient perovskite structure that is similar to that of SrO (1 − x) . This phenomenon can be explained by the dramatic increase of Fe 3+ and Fe 4+ in SrTi (1 − x) [Fe 3+ , Fe 4+ ] (x) O (3 − δ) perovskite structure [45,53,54]. The peaks at 131.9 eV Sr 3d (b) observed for all samples correspond to SrCO 3 and the peak at 133.80 eV, Sr 3d (c) observed corresponds to Sr (Perovskite) respectively (Fig.…”

Section: Xps Studiesmentioning

confidence: 84%

Preparation, surface state and band structure studies of SrTi(1−x)Fe(x)O(3−δ) (x=0–1) perovskite-type nano structure by X-ray and ultraviolet photoelectron spectroscopy

et al. 2012

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Section: Xps Studiesmentioning

confidence: 84%

Preparation, surface state and band structure studies of SrTi(1−x)Fe(x)O(3−δ) (x=0–1) perovskite-type nano structure by X-ray and ultraviolet photoelectron spectroscopy

et al. 2012

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“…The lanthanum site can also be substituted with barium 58 as an alternative to Sr and on substitution with barium it was observed that the octahedral tilt angle was affected reducing the activation energy for conduction. 68 and spark plasma sintering 69 , with the latter technique used to reduce the sintering temperature and time taken to produce gas tight, high density membranes.…”

Section: Electrolytes Based On Abo 3 Perovskitementioning

confidence: 99%

Advanced Inorganic Materials for Solid Oxide Fuel Cells

Skinner¹,

Laguna‐Bercero²

2011

Energy Materials

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PC-SOFC -Proton conducting solid oxide fuel cell IT-SOFC -Intermediate temperature solid oxide fuel cell IntroductionFuel cells are widely regarded as a next generation technology that will contribute to reductions in emissions of gases responsible for climate change such as CO 2 . There are several modifications to the basic concept of a fuel cell that allow operation over a wide variety of temperatures and with differing fuels. One of the most promising types of fuel cell for large scale power generation and combined heat and power applications is the solid oxide fuel cell (SOFC). The solid oxide fuel cell offers many advantages over conventional combustion-based power generation technologies and has been the subject of intensive investigation for many years. As with all other fuel cells the SOFC is an electrochemical energy conversion device that converts the chemical energy contained within a fuel (for example, H 2 ) to useful electrical energy through an electrochemical oxidation process. Using the simplest fuel as an example the overall chemical reaction occurring is: To achieve this overall reaction it is essential that we consider the basic components of the fuel cell. A SOFC consists of three ceramic functional components (anode "fuel side", cathode "air side" and electrolyte) plus an electrical interconnect that is either ceramic or metallic depending upon the operating environment. These 4 components are referred to as the fuel cell and to achieve suitable power outputs these individual cells are connected to form a fuel cell stack. Schematics of two alternative designs of a single fuel cell are shown in Figure 1.At the anode the fuel is oxidised with the oxidant (oxygen) reduced at the cathode.These two components are separated by a gas tight electrolyte membrane that is a pure ionic conductor, transporting the oxide ion species from the cathode to the fuel side. This process releases electrons to an external circuit, providing the useful electrical power. These reactions are summarised as:cathode reaction Evidently these electrode reactions are significantly more complex than shown in equations 1.1. and 1.2 and fuller discussions of the proposed fuel oxidation and oxygen reduction electrode reactions are given in [1][2][3][4].It is therefore clear that in a solid oxide fuel cell there are many processes that require optimised materials, and consequently the SOFC is a complex solid state device. As a summary, it is essential that the electrolyte is a gas tight, pure ionic conductor stable over a wide pO 2 range (>10 -24 atm). Anodes have to possess stability in reducing conditions with both high ionic and electronic conductivity, and chemical compatibility with the electrolyte material. Similar properties are required for the cathode with the exception that stability is now in oxidising environments.Additionally the cathode has to be catalytically active towards oxygen reduction, which is often a rate limiting process, particularly at lower temperatures of operation (<650 o C). These are demanding pr...

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“…Moreover, the concentration and nature of the dopants drastically affect the conductivity. Nickel and cobalt containing systems are considered to be the best conductors and chromium and manganese containing systemsthe worst [2,[6][7][8][9][10][11][12][13][14][15][16][17][18]. The reasons of the influence of the dopants, as a rule, are not discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Lanthanum gallate doped with bivalent elements and cobalt is much investigated owing to a sufficiently high ionic conductivity [9,10,14,[16][17][18]. In this case the data on conductivity appear to differ significantly, strongly depend on the content of diamagnetic additions and cobalt, and are badly reproduced.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, in [24] the concentration of cobalt in the system was found to decrease substantially during high-temperature sintering compared to the equation of the solid state reaction. We emphasize that in all the works devoted to the study of cobalt containing systems [9,10,14,[16][17][18]] the analysis of the cobalt content after sintering was not carried out, which, to some extent cast some doubt on the quantitative data on optimizing the composition of electron-ionic conductors. Gallium oxide is known to be characterized by a sufficiently high volatility under vacuum [25], which can result in its selective evaporation from the batch and in substantial discrepancies between the composition specified for the synthesis and the obtained composition, and also in the emergence of additional phases.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic study of interatomic interactions, synthesis, structural and mass spectroscopy investigations of lanthanum gallate doped with cobalt and magnesium

Королев

Чежина

Лопатин

2015

Journal of Alloys and Compounds

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a b s t r a c tFor the first time by X-ray method two phases of the solid solutions LaCo x Ga 1À1.2x Mg 0.2x O 3Àd and LaCo xGa 1À1.5x Mg 0.5x O 3Àd (x = 0.01-0.10) with different structure were found -rhombohedral and orthorhombic phases. On the basis of the data on evaporation of the components a synthetic procedure was advanced allowing the losses of cobalt to be minimized. The study of magnetic characteristics of obtained solid solutions showed the formation of high nuclearity clusters containing cobalt atoms, and also magnesium and associated vacancies even in diluted solid solutions. Clusters are characterized by a competition between ferro-and antiferromagnetic exchange interactions, whereas the long order exchange is antiferromagnetic.

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Sol–gel synthesis, X-ray photoelectron spectroscopy and electrical conductivity of Co-doped (La, Sr)(Ga, Mg)O3− perovskites

Cited by 63 publications

References 30 publications

Preparation, surface state and band structure studies of SrTi(1−x)Fe(x)O(3−δ) (x=0–1) perovskite-type nano structure by X-ray and ultraviolet photoelectron spectroscopy

Preparation, surface state and band structure studies of SrTi(1−x)Fe(x)O(3−δ) (x=0–1) perovskite-type nano structure by X-ray and ultraviolet photoelectron spectroscopy

Advanced Inorganic Materials for Solid Oxide Fuel Cells

Magnetic study of interatomic interactions, synthesis, structural and mass spectroscopy investigations of lanthanum gallate doped with cobalt and magnesium

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