Improved thermal stability of zirconia macroporous structures via homogeneous aluminum oxide doping and nanostructuring using atomic layer deposition

Gehensel, Raphael J.; Zierold, Robert; Schaan, Gunnar; Shang, Guo Liang; Petrov, Alexander Yu.; Eich, Manfred; Blick, Robert H.; Krekeler, Tobias; Janßen, Rolf; Furlan, Kaline P.

doi:10.1016/j.jeurceramsoc.2021.02.007

Cited by 9 publications

(3 citation statements)

References 71 publications

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“…Useful knowledge, gained before the present experiments on either Al-doped ZrO2, or sandwiched Al2O3 and ZrO2 films, allowed one to expect the formation of metastable cubic or tetragonal phase of ZrO2, highly stable against heat-treatments [32,33]. Overall, an insulating material with bandgap likely lower than that characteristic of stable bulk ZrO2 would form [34,35].…”

Section: Methodsmentioning

confidence: 73%

Structure and Electrical Properties of Zirconium-Aluminum-Oxide Films Engineered by Atomic Layer Deposition

et al. 2022

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Thin films containing either multilayer ZrO2:Al2O3 structures or ZrO2 deposited on ZrxAlyOz buffer layers were characterized. The films were grown by atomic layer deposition (ALD) at 300 °C from ZrCl4, Al(CH3)3, and H2O. The multilayer ZrO2:Al2O3 structures were grown repeating different combinations of ZrO2 and Al2O3 ALD cycles while the ZrxAlyOz layers were obtained in a novel process using ALD cycles based on successive adsorption of ZrCl4 and Al(CH3)3, followed by surface reaction with H2O. The films were grown on TiN electrodes, and supplied with Ti top electrodes, whereby ZrxAlyOz films were exploited as thin buffer layers between TiN and ZrO2. The as-deposited ZrO2 films and ZrO2:Al2O3 structures with sufficiently low concentrations of Al2O3 were crystallized in the form of cubic or tetragonal ZrO2 polymorph possessing relative permittivities reaching 35. Notably, multilayered ZrO2:Al2O3 films could exhibit resistive switching behavior with ratios between low- and high-resistive-state current values, extending up to five orders of magnitude. Implications of multilevel switching were recorded. In the double-layered ZrxAlyOz-ZrO2 stacks, the ON/OFF current ratios remained below 40, but the endurance could become extended over 3000 cycles. Remarkably, instabilities, when detected in endurance behavior expressed by reduction in an ON/OFF current ratio could be compensated and the current values restored by real time readjustment of the programming voltage amplitude.

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Section: Methodsmentioning

confidence: 73%

Structure and Electrical Properties of Zirconium-Aluminum-Oxide Films Engineered by Atomic Layer Deposition

et al. 2022

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“…Transformation toughening (T→M) is sensitive to mechanical and thermal stresses, and is a source of toughening in Y-stabilized zirconia [58]. Tetragonal phase is thermodynamically stable until 1367 K [59]; so, under sintering conditions, T→M transformation is not likely to occur [60,61]. Another significant feature is that 3 wt.% of yttrium oxide is optimal for tetragonal phase stabilizing; otherwise, with a higher amount of Y 2 O 3 (7 wt.%), the mechanical characteristics tended to worsen [62,63].…”

Section: Resultsmentioning

confidence: 99%

Three-Dimensional-Printed Molds from Water-Soluble Sulfate Ceramics for Biocomposite Formation through Low-Pressure Injection Molding

et al. 2023

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Powder mixtures of MgSO4 with 5–20 mol.% Na2SO4 or K2SO4 were used as precursors for making water-soluble ceramic molds to create thermoplastic polymer/calcium phosphate composites by low pressure injection molding. To increase the strength of the ceramic molds, 5 wt.% of tetragonal ZrO2 (Y2O3-stabilized) was added to the precursor powders. A uniform distribution of ZrO2 particles was obtained. The average grain size for Na-containing ceramics ranged from 3.5 ± 0.8 µm for MgSO4/Na2SO4 = 91/9% to 4.8 ± 1.1 µm for MgSO4/Na2SO4 = 83/17%. For K-containing ceramics, the values were 3.5 ± 0.8 µm for all of the samples. The addition of ZrO2 made a significant contribution to the strength of ceramics: for the MgSO4/Na2SO4 = 83/17% sample, the compressive strength increased by 49% (up to 6.7 ± 1.3 MPa), and for the stronger MgSO4/K2SO4 = 83/17% by 39% (up to 8.4 ± 0.6 MPa). The average dissolution time of the ceramic molds in water did not exceed 25 min.

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“…In comparison, charged polystyrene opals with carboxylic or amino functionalization assembled on top of the NAA by drop cast [ 172 ] achieve a maximum value of 3.16 W m 2 ; however, with different performances regarding maximum power density depending on the functionalization and structural arrangement of the opals. This interesting result combined with the multitude of processes available to fabricate 3D opal photonic crystal structures, [ 174 ] including recent advances in 3D printing combined with self‐assembly, [ 175 ] and 3D structures of optically relevant metal oxides produced by ALD [ 176–179 ] opens the path for potential future developments in this highly dynamic field. Alternative approaches include changing the electrolyte from acidic to alkaline (i.e., sodium tetraborate) to increase the range of lattice constant (i.e., 250–600 nm) on curved surfaces without oxide burning.…”

Section: Functionalization Of Naa–pcsmentioning

confidence: 99%

Nanoporous Anodic Alumina Photonic Crystals for Sunlight Harvesting Applications: A Perspective

et al. 2022

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Nanoporous anodic alumina (NAA) fabricated by anodization of aluminum is a versatile platform material with tailorable geometric, optical, and chemical features for specific light‐based technologies and applications. Recent advances in anodization technology have enabled a new generation of NAA‐based photonic crystals (PCs)—periodic dielectric nanoporous structures that selectively allow, forbid, and confine the flow of incoming electromagnetic waves of specific wavelengths across their structure. NAA–PCs provide exciting new opportunities to engineer light–matter interactions with versatility across the broad spectrum, from UV to IR. But despite these fundamental advances, demonstrations of sunlight‐harvesting technologies based on NAA–PCs are still limited. Herein, an up‐to‐date summary of recent advances in NAA–PC technology is provided, and proof‐of‐concept demonstrations and future pathways to propel this versatile platform material across sunlight‐harvesting technologies such as photocatalysis, photoelectrocatalysis, photothermal energy conversion, and solar cells are discussed.

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Improved thermal stability of zirconia macroporous structures via homogeneous aluminum oxide doping and nanostructuring using atomic layer deposition

Cited by 9 publications

References 71 publications

Structure and Electrical Properties of Zirconium-Aluminum-Oxide Films Engineered by Atomic Layer Deposition

Structure and Electrical Properties of Zirconium-Aluminum-Oxide Films Engineered by Atomic Layer Deposition

Three-Dimensional-Printed Molds from Water-Soluble Sulfate Ceramics for Biocomposite Formation through Low-Pressure Injection Molding

Nanoporous Anodic Alumina Photonic Crystals for Sunlight Harvesting Applications: A Perspective

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