Thickness-dependent transport properties of Sr4Fe6O13 epitaxial thin films

Pardo, J. A.; Santiso, J.; Solís, Cecilia; García, G.; Figueras, A.; Rossell, Marta D.

doi:10.1016/j.ssi.2005.11.024

Cited by 12 publications

(6 citation statements)

References 27 publications

(38 reference statements)

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“…Another example of the strong variation of transport properties in thin films of layered materials was reported by Solis and co workers 92,116 for the Sr 4 Fe 6 O 13 material. A comprehensive study was carried out by varying the film thickness of b-axis oriented epitaxial thin films grown on three different substrates (SrTiO 3 , NdGaO 3 and LaAlO 3 ) and measuring and comparing their conductivity properties.…”

Section: Double Perovskites and Layered Ferritesmentioning

confidence: 79%

“…It is very likely that in ceramic samples the grain boundaries may have substantially blocked the oxygen migration, although some studies in highly crystalline Sr 4 Fe 6 O 13 epitaxial films did not show any clear evidence of ionic conductivity. 92 Other reported Fe-oxide based layered MIECs present the Ruddlesden-Popper structure discussed above. The existence of Fe-based n > 1 R-P phases makes them of particular interest for understanding and developing new compounds with this structure.…”

Section: Layered Ferritesmentioning

confidence: 92%

“…In addition to the studies of nickelates from the RP family, other examples of epitaxial films of layered cathode materials are the synthesis by PLD of thin films of the double perovskite material GBCO by Burriel et al, 115 PBCO carried out by Kim et al 17 and the synthesis of thin films of the perovskite-related structure Sr 4 Fe 6 O 13 carried out by Solı ´s et al 92,116 First attempts on double perovskites epitaxial thin films growth show the microstructural complexity of this family of compounds in an epitaxial thin film form. GBCO first growth studies 115 revealed the presence of a high density of planar defects, consisting of additional rock-salt GdO layers (as in RP phases) while PBCO films grown on SrTiO 3 (001) single crystals 17 show at least two different microstructural regions corresponding to two different oxygen exchange rates measured by ECR.…”

Section: Double Perovskites and Layered Ferritesmentioning

confidence: 99%

See 2 more Smart Citations

Advances in layered oxide cathodes for intermediate temperature solid oxide fuel cells

Tarancón

Burriel

Santiso³

et al. 2010

J. Mater. Chem.

404

282

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Section: Double Perovskites and Layered Ferritesmentioning

confidence: 79%

Section: Layered Ferritesmentioning

confidence: 92%

Section: Double Perovskites and Layered Ferritesmentioning

confidence: 99%

See 1 more Smart Citation

Advances in layered oxide cathodes for intermediate temperature solid oxide fuel cells

Tarancón

Burriel

Santiso³

et al. 2010

J. Mater. Chem.

404

282

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“…This is in good agreement with previously reported electronÀhole conductivity measurements in epitaxial SFO film which showed that the conductivity of the films can be tailored by changing the oxygen content in the double layers. 44 In comparison, changes in the fine structure of the Fe L 2,3 -edge are far more subtle (Figure 7). The spectra consist of two "white line" peaks which are separated by ∼13 eV due to the spinÀorbit splitting of the Fe 2p core hole.…”

Section: Resultsmentioning

confidence: 98%

Direct Evidence of Stacking Disorder in the Mixed Ionic-Electronic Conductor Sr₄Fe₆O_12+δ

et al. 2013

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Determining the structure-to-property relationship of materials becomes particularly challenging when the material under investigation is dominated by defects and structural disorder. Knowledge on the exact atomic arrangement at the defective structure is required to understand its influence on the functional properties. However, standard diffraction techniques deliver structural information that is averaged over many unit cells. In particular, information about defects and order-disorder phenomena is contained in the coherent diffuse scattering intensity which often is difficult to uniquely interpret. Thus, the examination of the local disorder in materials requires a direct method to study their structure on the atomic level with chemical sensitivity. Using aberration-corrected scanning transmission electron microscopy in combination with atomic-resolution electron energy-loss spectroscopy, we show that the controversial structural arrangement of the Fe2O2+δ layers in the mixed ionic-electronic conducting Sr4Fe6O12+δ perovskite can be unambiguously resolved. Our results provide direct experimental evidence for the presence of a nanomixture of "ordered" and "disordered" domains in an epitaxial Sr4Fe6O12+δ thin film. The most favorable arrangement is the disordered structure and is interpreted as a randomly occurring but well-defined local shift of the Fe-O chains in the Fe2O2+δ layers. By analyzing the electron energy-loss near-edge structure of the different building blocks in the Sr4Fe6O12+δ unit cell we find that the mobile holes in this mixed ionic-electronic conducting oxide are highly localized in the Fe2O2+δ layers, which are responsible for the oxide-ion conductivity. A possible link between disorder and oxygen-ion transport along the Fe2O2+δ layers is proposed by arguing that the disorder can effectively break the oxygen diffusion pathways.

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“…There are a number of perovskite-related layered oxides that have been proposed or are presently being investigated as cathodes for SOFCs. [97][98][99][100][101][102][103][104][105][106][107][108][109][110] Of particular importance are the iron, copper and cobalt containing perovskite-related oxides. 6,105 The mechanism and energetics of oxygen transport in most of these materials is a relatively unchartered area because of the immense number of possible combinations due to differences in composition, stoichiometry, and crystal structure.…”

Section: Other Examples To Layered Oxidesmentioning

confidence: 99%

Oxygen diffusion in solid oxide fuel cell cathode and electrolyte materials: mechanistic insights from atomistic simulations

Chroneos

Yildiz

Tarancón

et al. 2011

Energy Environ. Sci.

392

264

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Solid oxide fuel cells are of technological interest as they offer high efficiency for energy conversion in a clean way. Understanding fundamental aspects of oxygen self-diffusion in solid state ionic systems is important for the discovery of next-generation electrolyte and cathode material compositions and microstructures that can enable the operation of SOFCs at lower temperatures more efficiently, durably, and economically. In the present perspective article, we illustrate the important role of modelling and simulations in providing direct atomic scale insights on the oxygen ion transport mechanisms and conduction properties in the cathode and electrolyte materials, and in accelerating the progress from old materials to new concepts. We first summarize the ionic transport mechanisms in the traditional cathode and electrolyte materials which have been widely studied. We then pay our attention to the non-traditional materials and their oxygen transport paths from recent studies, focusing on structural and transport anisotropy and lattice dynamics. Lastly, we highlight the new developments in the potential to increase the ionic conductivity of the traditional materials through external mechanical stimuli, bringing about the mechano-chemical coupling to drive fast ionic transport.

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Thickness-dependent transport properties of Sr4Fe6O13 epitaxial thin films

Cited by 12 publications

References 27 publications

Advances in layered oxide cathodes for intermediate temperature solid oxide fuel cells

Advances in layered oxide cathodes for intermediate temperature solid oxide fuel cells

Direct Evidence of Stacking Disorder in the Mixed Ionic-Electronic Conductor Sr₄Fe₆O_12+δ

Oxygen diffusion in solid oxide fuel cell cathode and electrolyte materials: mechanistic insights from atomistic simulations

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Thickness-dependent transport properties of Sr4Fe6O13 epitaxial thin films

Cited by 12 publications

References 27 publications

Advances in layered oxide cathodes for intermediate temperature solid oxide fuel cells

Advances in layered oxide cathodes for intermediate temperature solid oxide fuel cells

Direct Evidence of Stacking Disorder in the Mixed Ionic-Electronic Conductor Sr4Fe6O12+δ

Oxygen diffusion in solid oxide fuel cell cathode and electrolyte materials: mechanistic insights from atomistic simulations

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Direct Evidence of Stacking Disorder in the Mixed Ionic-Electronic Conductor Sr₄Fe₆O_12+δ