Enthalpies of formation in the scandia‐zirconia system

Grosso, Robson L.; Muccillo, E.N.S.; Castro, Ricardo H. R.

doi:10.1111/jace.14945

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…The characteristic cubic peaks of YSZ were detected from the commercial 8mol% YSZ substrate, with the following obtained lattice parameters: 5.136 Å (SSR-ball-milled) and 5.133 Å (GNP-ballmilled). ScSZ can exist in either monoclinic, cubic, tetragonal (t and t'), or rhombohedral (β, λ, and δ) forms, where cubic and tetragonal ScSZ are known to exhibit excellent electrochemical properties [11][12]. The calculated lattice parameters for the cubic phases of ScSZ are 5.087 Å (SSR-ball-milled) and 5.087 Å (GNP-ball-milled).…”

Section: Resultsmentioning

confidence: 99%

Screen-Printing of NiO-ScSZ on YSZ Substrate Using Solid-State Reaction and Glycine-Nitrate Process Precursors for Solid Oxide Electrochemical Cells

Macalisang

Cervera

2023

KEM

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Solid oxide electrochemical cells (SOCs) consisting of solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) are widely studied for the development of high-efficiency energy generation and storage devices. To investigate the effect of precursor particle size on the microstructural and morphological properties of the electrode, glycine nitrate process and solid-state reaction ball-milling were utilized as synthesis methods for Nickel oxide-scandia stabilized zirconia (NiO-ScSZ) powders. The synthesized powders were then screen-printed on commercial YSZ solid electrolyte substrates. The structure and morphology of the sintered electrodes were investigated. Particle size analysis (PSA) revealed that NiO-ScSZ precursor powders obtained from GNP ball-milled had a smaller average particle size than solid-state reaction ball-milled powders. For the sintered NiO-ScSZ films, cubic structures of both NiO and ScSZ have been observed from the X-ray diffraction (XRD) patterns. A better porous morphology with less agglomeration and better dispersion of NiO and ScSZ phases was revealed by the scanning electron microscopy (SEM) micrographs and elemental mapping for the GNP-ball-milled synthesized powders.

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Section: Resultsmentioning

confidence: 99%

Screen-Printing of NiO-ScSZ on YSZ Substrate Using Solid-State Reaction and Glycine-Nitrate Process Precursors for Solid Oxide Electrochemical Cells

Macalisang

Cervera

2023

KEM

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“…Yttria-stabilized zirconia (YSZ) is the typical zirconia-based solid electrolyte used for SOECs due to its high oxide ion conductivity at elevated temperatures [1][2][3][4]. Scandia-stabilized zirconia (ScSZ), on the other hand, is also used as a solid electrolyte due to its remarkable higher ionic conductivity, almost 3x, as compared to YSZ; however, the high conductivity of the cubic phase ScSZ is limited to a narrow temperature range and with the cubic phase structural stability dependent on doping concentration and temperature [5][6][7][8]. In order to circumvent these concerns and to improve the solid electrolyte properties and performance, fabrication into thin films and co-doping are some of the promising solutions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

et al. 2022

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Scandium (Sc) and yttrium (Y) co-doped ZrO2 (ScYSZ) thin films were prepared on a SiO2-Si substrate via pulsed laser deposition (PLD) method. In order to obtain good quality thin films with the desired microstructure, various oxygen partial pressures (PO2) from 0.01 Pa to 10 Pa and substrate temperatures (Ts) from 25 °C to 800 °C were investigated. X-ray diffraction (XRD) patterns results showed that amorphous ScYSZ thin films were formed at room substrate temperature while cubic polycrystalline thin films were obtained at higher substrate temperatures (Ts = 200 °C, 400 °C, 600 °C, 800 °C). Raman spectra revealed a distinct Raman shift at around 600 cm−1 supporting a cubic phase. However, a transition from cubic to tetragonal phase can be observed with increasing oxygen partial pressure. Photoemission spectroscopy (PES) spectra suggested supporting analysis that more oxygen vacancies in the lattice can be observed for samples deposited at lower oxygen partial pressures resulting in a cubic structure with higher dopant cation binding energies as compared to the tetragonal structure observed at higher oxygen partial pressure. On the other hand, dense morphologies can be obtained at lower PO2 (0.01 Pa and 0.1 Pa) while more porous morphologies can be obtained at higher PO2 (1.0 Pa and 10 Pa).

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“…Most often these are admixtures of rare earth elements or their oxides: CeO 2 , Gd 2 O 3 , Sm 2 O 3 , Bi 2 O 3 , Yb 2 O 3 ,Eu 2 O 3 and Al 2 O 3 , e.g., [ 3 , 17 , 18 , 19 , 22 , 24 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 37 , 38 ]. It is also believed [ 25 , 39 , 40 , 41 ] that this effect can be achieved by providing material with a nanocrystalline microstructure. Addition of dopants may cause their segregation during long-term cell operation and the consequent reduction in its ionic conductivity and mechanical strength [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapour Deposition of Scandia-Stabilised Zirconia Layers on Tubular Substrates at Low Temperatures

Sawka

2022

Materials

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The paper presents results of investigation on synthesis of non-porous ZrO2-Sc2O2 layers on tubular substrates by MOCVD (metalorganic chemical vapor deposition) method using Sc(tmhd)3 (Tris(2,2,6,6-tetramethyl-3,5-heptanedionato)scandium(III), 99%) and Zr(tmhd)4 (Tetrakis(2,2,6,6-tetramethyl-3,5-heptanedionato)zirconium)(IV), 99.9+%) as basic reactants. The molar content of Sc(tmhd)3 in the gas mixture was as follows: 14, 28%. The synthesis temperature was in the range of 600–700 °C. The value of extended Grx/Rex2 expression (Gr-Grashof number, Re-Reynolds number and x-the distance from the gas inflow point) was less than 0.01. The layers were deposited under reduced pressure or close to atmospheric pressure. The layers obtained were tested using scanning electron microscope (SEM) with an energy dispersive X-ray spectroscope (EDS) microanalyzer, X-ray diffractometer and UV-Vis spectrophotometer. The layers deposited were non-porous, amorphous or nanocrystalline with controlled chemical composition. The layers synthesized at 700 °C were nanocrystalline. ZrO2-Sc2O3 layers with 14 mol.% Sc2O3 content had a rhombohedral structure.

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Enthalpies of formation in the scandia‐zirconia system

Cited by 7 publications

References 34 publications

Screen-Printing of NiO-ScSZ on YSZ Substrate Using Solid-State Reaction and Glycine-Nitrate Process Precursors for Solid Oxide Electrochemical Cells

Screen-Printing of NiO-ScSZ on YSZ Substrate Using Solid-State Reaction and Glycine-Nitrate Process Precursors for Solid Oxide Electrochemical Cells

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

Chemical Vapour Deposition of Scandia-Stabilised Zirconia Layers on Tubular Substrates at Low Temperatures

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