Time–Temperature–Transformation (TTT) Diagrams for Crystallization of Metal Oxide Thin Films

Rupp, Jennifer L. M.; Scherrer, Barbara; Schäuble, Nina; Gauckler, Ludwig J.

doi:10.1002/adfm.201000377

Cited by 45 publications

(44 citation statements)

References 55 publications

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“…It is known from precipitation-based film processing that ceria tends to show nanostructures of isolated grains [28,29]. Segregation of ceria For coatings with 25 (not shown) and 33 mol % ceria, the same photocatalytic activity was found as for the 17-83 coating.…”

Section: Discussionmentioning

confidence: 67%

“…It is known from precipitation-based film processing that ceria tends to show nanostructures of isolated grains [28,29]. Segregation of ceria the stearic acid degradation is lower, but clearly visible if one compares the bands with their heights before UV-A irradiation.…”

Section: Discussionmentioning

confidence: 99%

“…It is known from precipitation-based film processing that ceria tends to show nanostructures of isolated grains [28,29]. Segregation of ceria clusters are stabilized by solvent molecules, which hinder cluster contacts and further grain growth by Oswald ripening [30].…”

Section: Discussionmentioning

confidence: 99%

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Interface Crystallization of Ceria in Porous Silica Films for Solar Applications

Helsch

Deubener

2017

Crystals

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Antireflective (AR) coatings with photocatalytic activity for solar cover glasses are extensively investigated at present, mostly in multilayer systems including titania. In this study, bifunctional single coats from porous silica in combination with up to 33 mol % ceria were prepared by sol-gel dip-coating on low-iron soda-lime float glass. After heat treatment for one hour at 350 • C, the coated glasses were characterized. Solar transmittance decreased with increasing ceria content, whereas photocatalytic activity increases. Crystallization of cubic ceria was detected by grazing incidence X-ray diffraction. Chemical depth profiling by secondary neutral mass spectrometry revealed the enrichment of cerium at the coating surface as well as at the interface to the glass substrate. Self-assembled ceria crystallization at the interfaces resulted in a three-layered mesostructure of the coating, which was verified by field-emission scanning electron spectroscopy. Cubic ceria crystals at the interface act as a barrier for the sodium diffusion from the substrate, which prevents the poisoning of the photocatalyst, while those crystals at the surface act as an electron donor for photooxidation processes, both enabling adequate photocatalytic activity. The triple-layer architecture with the sequence of high/low/high refractive index materials allows for optical interference sustaining the AR-function.

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

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Interface Crystallization of Ceria in Porous Silica Films for Solar Applications

Helsch

Deubener

2017

Crystals

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“…Deposition conditions such as the reduced temperature (600°C) and the high deposition rate (2.7-3.1 Å/s) may have resulted in the columnar structure. The existence of amorphous residuals may also affect the conductivity [13,14]. However, as shown in XRD patterns (Figs.…”

Section: Pelletmentioning

confidence: 95%

“…The ionic conductivities of polycrystalline ceria thin films deposited on resistive substrates were often lower than those of pellets or single crystalline films [4][5][6][7][8]. The lattice strain of GDC (Gd 0.2 Ce 0.8 O 2-δ ) thin films and residual amorphous phase that remained in the films affect the ionic conduction [13,14]. Although the role of grain size on the ionic transport is still controversial, the grain boundaries in the film reduce the conductivity [8,13,15].…”

Section: Introductionmentioning

confidence: 97%

Effect of Al- or Ga-additive on ionic conductivity of thin-film Gd-doped ceria

2013

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Non‐stoichiometry in Oxide Thin Films: A Chemical Capacitance Study of the Praseodymium‐Cerium Oxide System

Chen

Bishop

Tuller

2012

Adv Funct Materials

113

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While the properties of functional oxide thin fi lms often depend strongly on their oxygen stoichiometry, there have been few ways to extract this information reliably and in situ. In this work, the derivation of the oxygen nonstoichiometry of dense Pr 0.1 Ce 0.9 O 2 − δ thin fi lms from an analysis of chemical capacitance obtained by impedance spectroscopy is described. Measurements are performed on electrochemical cells of the form Pr 0.1 Ce 0.9 O 2 − δ / Y 0.16 Zr 0.84 O 1.92 /Pr 0.1 Ce 0.9 O 2 − δ over the temperature range of 450 to 800 ° C and oxygen partial pressure range of 10 − 5 to 1 atm O 2 . With the aid of a defect equilibria model, approximations relate chemical capacitance directly to non-stoichiometry, without need for fi tting parameters. The calculated non-stoichiometry allows extraction of the thermodynamic constants defi ning defect generation. General agreement of these constants with bulk values derived by thermogravimetric analysis is found, thereby confi rming the suitability of this technique for measuring oxygen non-stoichiometry of thin oxide fi lms. Potential sources of error observed in earlier chemical capacitance studies on perovskite structured oxide fi lms are also discussed.

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Time–Temperature–Transformation (TTT) Diagrams for Crystallization of Metal Oxide Thin Films

Cited by 45 publications

References 55 publications

Interface Crystallization of Ceria in Porous Silica Films for Solar Applications

Interface Crystallization of Ceria in Porous Silica Films for Solar Applications

Effect of Al- or Ga-additive on ionic conductivity of thin-film Gd-doped ceria

Non‐stoichiometry in Oxide Thin Films: A Chemical Capacitance Study of the Praseodymium‐Cerium Oxide System

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