Equilibrium Pressures of Oxygen over Ag[sub 2]O-Ag at Various Temperatures

Otto, Earl M.

doi:10.1149/1.2424083

Cited by 27 publications

(15 citation statements)

References 5 publications

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“…The dissociation pressures of Ag 2 O, to silver and oxygen gas, have been studied over a large range of temperatures. 7,[12][13][14]33,34 All the results are in good agreement.…”

Section: (B) Ag 2 O Phasementioning

confidence: 67%

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Thermodynamic Assessment of the Silver–Oxygen System

Assal

Hallstedt

Gauckler

1997

Journal of the American Ceramic Society

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An assessment of the silver–oxygen system has been made, and a consistent set of thermodynamic parameters has been optimized. The calculated thermodynamic properties and phase relations are in good agreement with the experimental data. Ag2O is the only phase that is commonly found within the system. In air, it decomposes to silver and oxygen gas at 420 K. There is a eutectic between silver and Ag2O at a temperature of 804 K, an oxygen partial pressure (PO2) of 526 bar (5.26 × 107 Pa), and an oxygen mole fraction in the liquid phase of 0.25. Uncertainties remain on the Ag2O liquidus for PO2 > 108 Pa. An ionic two‐sublattice model has been used to describe the liquid phase. This work is part of a study of interactions between compounds from the bismuth‐strontium‐calcium‐copper‐oxygen system and silver.

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“…The dissociation pressures of Ag 2 O, to silver and oxygen gas, have been studied over a large range of temperatures. 7,[12][13][14]33,34 All the results are in good agreement.…”

Section: (B) Ag 2 O Phasementioning

confidence: 67%

“…Calculated potential phase diagram of the silver-oxygen system compared with experimental data7,[10][11][12][13][14]33,34 (1 bar ‫ס‬ 10 5 Pa).…”

mentioning

confidence: 99%

Thermodynamic Assessment of the Silver–Oxygen System

Assal

Hallstedt

Gauckler

1997

Journal of the American Ceramic Society

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“…23 In this article the results of O 2 adsorption studies on the ͑100͒, ͑110͒, and ͑111͒ surfaces of Ag were reported in the pressure range 10 −3 -1 Torr ͑ϳ10 −3 -10 −6 atm.͒. 26 28 Although Rovida et al proposed the formation of "an oxide developed only in two dimensions" they did not attempt to establish any details of the structural model although they did suggest that perhaps an oxide adlayer comprised of a plane of O atoms between two planes of Ag atoms was likely. 24,25 On exposure of O 2 ͑approximately 1 Torr or 10 −3 atm͒ to Ag͑111͒ a ͑4 ϫ 4͒ superstructure was observed with low energy electron diffraction ͑LEED͒.…”

Section: A 1970smentioning

confidence: 99%

When seeing is not believing: Oxygen on Ag(111), a simple adsorption system?

Michaelides

Reuter

Scheffler

2005

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

116

143

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Hard repulsive barrier in hot adatom motion during dissociative adsorption of oxygen on Ag (100) A number of recent studies indicate that, under the oxygen rich conditions of oxidation catalysis, some transition metal catalysts may be covered by thin oxide overlayers. Moreover, it has been suggested that such "surface-oxide" layers are catalytically active, possibly more active than the pure metal surfaces as was traditionally assumed. This contemporary picture can be traced back to Ag catalysis, where over 30 years ago it was suggested that the top layer of Ag͑111͒ reconstructed to an epitaxial Ag 2 O like overlayer upon exposure to oxygen ͓Rovida et al., Surf. Sci. 43, 230 ͑1974͔͒. Extensive experimental work, including scanning tunneling microscopy studies in which the oxide was apparently imaged with atomic resolution, as well as density-functional theory calculations, largely confirmed this interpretation. However, a review of published experimental data and new density-functional theory results presented here indicate that previous conclusions are significantly incomplete and that the structure of this original surface oxide must be reconsidered.

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“…Many researchers showed that the dissociation of Ag O into Ag and O is reversible [8]- [10]. As a result of thermodynamics prediction, it is considered that Ag O reduces into Ag at relatively low temperature in air.…”

Section: A Noble Metal Oxide Decomposition By Conventional Heating 1mentioning

confidence: 99%

Ecodesigns and applications for noble metal nanoparticles by ultrasound process

Hayashi

Takizawa

Inoue

et al. 2005

IEEE Trans. Electron. Packag. Manufact.

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Ecodesigns for nano-sized noble metal particles were investigated by a new liquid-solid (metal oxide-alcohol) system. We have reduced noble metal oxides as low-emission starting materials by ultrasound and tried to fabricate various noble metal nanoparticles (Ag, Au, Pt, Pd) at room temperature, Noble metal oxides were investigated during decomposition. These reductions are ecologically clean, because many noble metal oxides are not toxic, and during decomposition, O 2 is evolved. By choosing suitable conditions, it is reasonable to expect that this simple sonochemical process can be extended to obtain nano-sized metal particles.

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Equilibrium Pressures of Oxygen over Ag[sub 2]O-Ag at Various Temperatures

Cited by 27 publications

References 5 publications

Thermodynamic Assessment of the Silver–Oxygen System

Thermodynamic Assessment of the Silver–Oxygen System

When seeing is not believing: Oxygen on Ag(111), a simple adsorption system?

Ecodesigns and applications for noble metal nanoparticles by ultrasound process

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