Epitaxial superlattices of ionic conductor oxides

Orsini, Andrea; Medaglia, P. G.; Sanna, Simone; Traversa, Enrico; Licoccia, Silvia; Tebano, A.; Balestrino, G.

doi:10.1016/j.spmi.2008.10.047

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Herein, the same approach was extended to the growth of SDC/YSZ superlattices. Preliminary results on SDC/YSZ superlattices deposited onto perovskite substrates are reported in reference 19. However, in this case the electrochemical properties were affected by the substrate contribution.…”

supporting

confidence: 90%

Enhancement of Ionic Conductivity in Sm‐Doped Ceria/Yttria‐Stabilized Zirconia Heteroepitaxial Structures

Sanna

Esposito

Tebano

et al. 2010

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Recent developments in the fi eld of thin-fi lm growth technologies have allowed control at an atomic level of deposited layers, thus opening new perspectives in the fi eld of engineering of multilayers and heterostructures based on complex oxides. [ 1 ] In particular, it is expected that oxide heterostructures, with almost ideal interfaces, may lead to interesting artifi cial materials with novel properties. Artifi cial thin-fi lm oxide structures make the already complex individual bulk properties even more interesting through their interaction at the interface. Following such an approach, a number of heterostructures have been tailored which show extraordinary properties that do not belong to the individual layers. These range from superconductivity at the interface between nonsuperconducting layers to high-mobility 2D conductivity at the interface between insulating oxides. [ 2 , 3 ] The number of possible combinations of these oxides is enormous, and the potential for novel behavior having practical applications represents a strong motivation for this research.The same approach can be applied to heterostructures based on oxide ionic conductors provided that the issues concerning structural match at the interface are solved. The interest in heterostructures based on oxide ionic conductors is driven by the space-charge-zone effects at the interface, which can increase the charge-carrier concentration locally, and by interface mobility effects, the latter being of particular relevance in the case of materials with high defect density and relatively low mobility. The potential impact of oxide ionic conductor superlattices has been shown for superlattices based on CaF 2 and BaF 2 layers, grown by molecular beam epitaxy, which exhibited an increase in ionic conductivity

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supporting

confidence: 90%

Enhancement of Ionic Conductivity in Sm‐Doped Ceria/Yttria‐Stabilized Zirconia Heteroepitaxial Structures

Sanna

Esposito

Tebano

et al. 2010

Small

107

116

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“…Current thin film deposition techniques allow for the fabrication of epitaxially grown oxides with high levels of control over the microstructure, stoichiometry and lattice mismatch of individual layers [24,25,26,27,28]. These developments have attracted much attention to this area of research because they might open a new avenue for SOFC electrolyte optimization in a way similar to that which has been achieved in Si-based semiconductors [29].…”

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confidence: 99%

Strain effects on the ionic conductivity of Y-doped ceria: A simulation study

2013

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In this paper we report a computational study of the effects of strain on the conductivity of Y-doped ceria (YDC). This material was chosen as it is of technological interest in the field of Solid Oxide Fuel Cells (SOFCs). The simulations were performed under realistic operational temperatures and strain ( ) levels. For bulk and thin film YDC, the results show that tensile strain leads to conductivity enhancements of up to 3.5 × and 1.44 ×, respectively. The magnitude of these enhancements is in agreement with recent experimental and computational evidence. In addition, the methods presented herein allowed us to identify enhanced ionic conductivity in the surface regions of YDC slabs and its anisotropic character.

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“…Such processes lead to vast amounts of energy consumption, increased process time and elevated final cost of the product. Some of the techniques referred to above (ALD, PLD) do not demand a post-sintering process [3], but their high cost is prohibiting for commercial application. Other difficulties that arise, related to high-temperature SOC counterpart construction, are interfacial diffusion at the electrode/electrolyte interface and thermal stresses due to mismatch in thermal expansion coefficients of the layers, followed by mechanical damage [4].…”

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confidence: 99%

Thermal Spray Multilayer Ceramic Structures with Potential for Solid Oxide Cell Applications

et al. 2021

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The objective of this paper is to manufacture free-standing solid oxide cells (SOCs) through the atmospheric plasma spray process (APS), without the aid of a metallic support nor the need for a post-process heating treatment. A five-layered cell was fabricated. Fused and crushed yttria-stabilized zirconia (YSZ) powder in the 5–22 μm particle size range was used in order to achieve a dense electrolyte layer, yet still permitting satisfactory ionic diffusivity. Nickel oxide (NiO) powder that was obtained by in-house flame spray (FS) oxidation of pure nickel (Ni) powder was mixed and sprayed with the original Ni-YSZ feedstock, so as to increase the porosity content in the supporting electrode. Two transition layers were sprayed, the first between the support electrode and the electrolyte (25% (Ni/NiO)–75% YSZ) and the second at the electrolyte and the end electrode interface (50% YSZ–50% lanthanum strontium manganite (LSM)). The purpose of intercalation of these transition layers was to facilitate the ionic motion and also to eliminate thermal expansion mismatches. All the as-sprayed layers were separately tested by an in-house developed acetone permeability comparative test (APCT). Electrodes with adequate porosity (25–30%) were obtained. Concerning electrolytes, relatively thick (150–200 µm) layers derived from fused and crushed YSZ were found to be impermeable to acetone, while thinner YSZ counterparts of less than 100 µm showed a low degree of permeability, which was attributed mostly to existent microcracks and insufficient interparticle cohesion, rather than to interconnected porosity.

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Epitaxial superlattices of ionic conductor oxides

Cited by 6 publications

References 9 publications

Enhancement of Ionic Conductivity in Sm‐Doped Ceria/Yttria‐Stabilized Zirconia Heteroepitaxial Structures

Enhancement of Ionic Conductivity in Sm‐Doped Ceria/Yttria‐Stabilized Zirconia Heteroepitaxial Structures

Strain effects on the ionic conductivity of Y-doped ceria: A simulation study

Thermal Spray Multilayer Ceramic Structures with Potential for Solid Oxide Cell Applications

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