Epitaxial pore-free gadolinia-doped ceria thin films on yttria-stabilized zirconia by RF magnetron sputtering

Ansari, Haris Masood; Rauscher, Michael; Dregia, S.A.; Akbar, Sheikh A.

doi:10.1016/j.ceramint.2013.05.014

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…The GDC patches predominantly act as sources to dope the YSZ surface in their proximity. At the employed temperatures, surface diffusion is expected to be several orders of magnitude faster than bulk diffusion. , Therefore, the dissolution of dopants (Gd 3+ and Ce 4+ ) with larger ionic radii than the host ions (Zr 4+ ) , creates stresses in a thin surface layer, and these conditions lead to the ATG-like morphological instability, where stress relaxation is achieved by introduction of free surfaces at the expense of increased surface energy. For quantitative comparison, we estimate the characteristic length scale λ* predicted by the ATG theory for a thin surface layer of doped YSZ, using the Y 2 O 3 –ZrO 2 system for illustration because of availability of the requisite information.…”

Section: Resultsmentioning

confidence: 99%

“…At the employed temperatures, surface diffusion is expected to be several orders of magnitude faster than bulk diffusion. 16,49 Therefore, the dissolution of dopants (Gd 3+ and Ce 4+ ) with larger ionic radii than the host ions (Zr 4+ ) 50,51 creates stresses in a thin surface layer, and these conditions lead to the ATG-like morphological instability, where stress relaxation is achieved by introduction of free surfaces at the expense of increased surface energy. nm, which is on the same order as the experimentally observed periods of the nanobar patterns, although the latter can be altered by coarsening, as discussed further below.…”

Section: Resultsmentioning

confidence: 99%

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Spontaneous Rippling and Subsequent Polymer Molding on Yttria-Stabilized Zirconia (110) Surfaces

et al. 2017

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Spontaneous nanoripple formation on (110) surfaces of yttria-stabilized zirconia, YSZ-(110), is achieved by diffusional surface doping with rare-earth oxides. Periodic arrays of parallel nanobars separated by channels (period ∼100 nm) grow out of the dopant sources, covering relatively wide areas of the surface (∼10 μm). The nanobars mound up on the surface by diffusion, exhibiting morphological uniformity and alignment, with their long axis lying parallel to the [11̅0] direction in the YSZ-(110) surface. The process for forming these nanobar arrays can be as simple as sprinkling of rare-earth oxide powder (dopant source) on YSZ-(110) surface and annealing in a high temperature air furnace. However, higher control on dopant dispersion on the surface is demonstrated with other techniques, including photolithography and inkjet printing. The ripple arrays extend anisotropically on the (110) surface, obeying the parabolic growth law, and showing principal values of the rate constant along [11̅0] (maximum) and [001] (minimum), as expected from the symmetry of the (110) surface. The self-patterned ceramic substrates are well-suited for pattern transfer by replica molding, as illustrated by single-step molding with polydimethylsiloxane (PDMS), which is a widely used biomaterial in cell-culture studies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Spontaneous Rippling and Subsequent Polymer Molding on Yttria-Stabilized Zirconia (110) Surfaces

et al. 2017

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Flame-Sprayed Y2O3 Films with Metal-EDTA Complex Using Various Cooling Agents

et al. 2016

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In this study, yttrium oxide (Y 2 O 3 ) films were synthesized from a metal-ethylenediaminetetraacetic (metal-EDTA) complex by employing a H 2 -O 2 combustion flame. A rotation apparatus and various cooling agents (compressed air, liquid nitrogen, and atomized purified water) were used during the synthesis to control the thermal history during film deposition. An EDTAÁYÁH complex was prepared and used as the staring material for the synthesis of Y 2 O 3 films with a flame-spraying apparatus. Although thermally extreme environments were employed during the synthesis, all of the obtained Y 2 O 3 films showed only a few cracks and minor peeling in their microstructures. For instance, the Y 2 O 3 film synthesized using the rotation apparatus with water atomization units exhibited a porosity of 22.8%. The maximum film's temperature after deposition was 453°C owing to the high heat of evaporation of water. Cooling effects of substrate by various cooling units for solidification was dominated to heat of vaporization, not to unit's temperatures.

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Materials and nano-structural processes for use in solid oxide fuel cells: a review

Sharma

Park

et al. 2020

J. Korean Ceram. Soc.

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Epitaxial pore-free gadolinia-doped ceria thin films on yttria-stabilized zirconia by RF magnetron sputtering

Cited by 7 publications

References 14 publications

Spontaneous Rippling and Subsequent Polymer Molding on Yttria-Stabilized Zirconia (110) Surfaces

Spontaneous Rippling and Subsequent Polymer Molding on Yttria-Stabilized Zirconia (110) Surfaces

Flame-Sprayed Y2O3 Films with Metal-EDTA Complex Using Various Cooling Agents

Materials and nano-structural processes for use in solid oxide fuel cells: a review

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