Thermodynamic assessment of the Ag-Cu-O system

Assal, Jérôme; Hallstedt, Bengt; Gauckler, Ludwig J.

doi:10.1361/105497198770342085

Cited by 26 publications

(9 citation statements)

References 13 publications

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“…2) show a cubic structure with lattice parameters: a = b = c =0.43 nm, in agreement with the cell parameters for Cu 2 O. Although Assal and Gauckler 18 claimed that the Ag–Cu–O system does not contain any ternary solid phases, the Cu 2 O structure can apparently absorb some Ag in its structure.…”

Section: Resultssupporting

confidence: 75%

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Bals

Verbeeck

Tendeloo

et al. 2005

Journal of the American Ceramic Society

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The microstructural and compositional evolution during initial annealing of a superconducting (Bi,Pb)2Sr2Ca2Cu3O10+δ/Ag tape is studied using quantitative transmission electron microscopy. Special attention is devoted to the occurrence of Pb‐rich liquids, which are crucial for the Bi2Sr2CaCu2O8+δ to (Bi,Pb)2Sr2Ca2Cu3O10+δ transformation. Ca and/or Pb‐rich (Bi,Pb)2Sr2CaCu2O8+δ grains dissolve into a liquid, which reacts with Ca‐rich phases to increase the liquid's Ca‐content. This leads to (Bi,Pb)2Sr2Ca2Cu3O10+δ formation. Apparently, a Ca/Sr ratio of around 1 is sufficient to keep (Bi,Pb)2Sr2Ca2Cu3O10+δ nucleation going. It is confirmed that Ag particles are transported from the Ag‐sheath into the oxide core by the liquid and not by mechanical treatment of the tape.

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Section: Resultssupporting

confidence: 75%

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Bals

Verbeeck

Tendeloo

et al. 2005

Journal of the American Ceramic Society

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“…5. agree also with phase diagram of Cu-Ag-O system [11]. The liquid phase (toluene) evaporation, which enables to start a destruction of the dodecyl amine protective shell, decreases the electrical resistance in the second stage of the sandwich preparation because only then Ag nanoparticles can aggregate and form the sintered Ag layer.…”

Section: Discussionsupporting

confidence: 77%

Silver nanoparticles sintering at low temperature on a copper substrate: In situ characterization under inert atmosphere and air

Sopoušek

Buršı́k

Zálešák

et al. 2012

J min metall B Metall

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Silver nanoparticles (Ag-NPs) were prepared by wet synthesis. The Ag-NPs suspension and the copper substrate plate were used for a preparation of substrate-nanoparticle-substrate samples. The sandwich like samples Cu/Ag/Cu were prepared and investigated in-situ at the isothermal external conditions (IEC) and inside apparatus for simultaneous thermal analysis STA409 (DSC). The in-situ results of the electrical resistance were recorded during the Cu/Ag/Cu (IEC) sample preparation and heat treatment. Thermal effects of the Ag-NPs sintering between copper substrates were measured by differential scanning calorimetry (DSC) under different atmospheres. The prepared Cu/Ag/Cu sandwich samples were characterised by means of both optical and electron microscopy. The process of the low temperature sintering inside calorimeter of the Ag-NPs was monitored using both thermogravimetry (TG) and DSC technique under inert gas and under synthetic air. The exothermic heat effect of nanosilver sintering was evaluated

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“…To select the sample compositions and starting materials to investigate the Ag-Sr-Cu-O and Ag-Ca-Cu-O systems, we extrapolated from the known lower-order Ag-Cu-O, 6 Sr-Cu-O, 4 and Ca-Cu-O systems 5 and calculated equilibria just below the monotectic temperature at the monotectic composition. In the first system, solid silver, CuO, and Sr 14 Cu 24 O 41 are in equilibrium at P O 2 ‫ס‬ 10 5 Pa; liquid silver, CuO, and Sr 14 Cu 24 O 41 are in equilibrium at P O 2 ‫ס‬ 0.21 × 10 5 Pa; and liquid silver, Cu 2 O, and SrCu 2 O 2 are in equilibrium at P O 2 < 500 Pa.…”

Section: (1) Dta Measurementsmentioning

confidence: 99%

“…7 The descriptions of the oxide compounds and the face-centered cubic (fcc) structure (silver and copper) have been taken from previous assessments. [4][5][6] (…”

Section: (1) Solid Phasesmentioning

confidence: 99%

“…This work is based on optimizations of the Sr-Cu-O, 4 Ca-Cu-O, 5 and Ag-Cu-O systems. 6 The two missing ternaries-Ag-Sr-O and Ag-Ca-O-could not be studied experimentally or optimized, because silver does not perceptibly modify the phase relations in the Sr-O and Ca-O binaries. In the Sr-Cu-O and Ca-Cu-O systems, extrapolations by the CALPHAD method show that monotectic temperatures might be decreased significantly by the addition of silver.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Phase‐Diagram Study and Thermodynamic Optimization of the Silver‐Strontium‐Copper‐Oxygen (Ag‐Sr‐Cu‐O) and Silver‐Calcium‐Copper‐Oxygen (Ag‐Ca‐Cu‐O) Systems

Assal

Hallstedt

Gauckler

1999

Journal of the American Ceramic Society

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The phase relations in the silver‐strontium‐copper‐oxygen (Ag‐Sr‐Cu‐O) and silver‐calcium‐copper‐oxygen (Ag‐Ca‐Cu‐O) systems were studied in oxygen, air, and nitrogen environments, using differential thermal analysis and energy‐dispersive X‐ray spectrometry. The presence of silver reduces the melting temperature of the oxide liquid to a monotectic in the strontium‐ and calcium‐containing systems by 62 and 82 K, respectively (to 1222 and 1244 K, respectively) in oxygen. The oxide liquid dissolves silver (up to a metallic ratio of 0.17) in the Ag‐Sr‐Cu‐O system in oxygen at a temperature slightly higher than that required for monotectic reaction. In the Ag‐Ca‐Cu‐O system, the silver content has been measured to be 0.29 (metallic ratio). The oxide systems have been optimized using the experimental data from monotectics and those from lower‐order systems that have been published previously. This work is part of a project to evaluate the phase relations within the silver‐bismuth‐strontium‐calcium‐copper‐oxygen (Ag‐Bi‐Sr‐Ca‐Cu‐O) system and, in particular, to focus on the influence of silver on the phase equilibria around the superconducting phases during partial‐melt processing.

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Thermodynamic assessment of the Ag-Cu-O system

Cited by 26 publications

References 13 publications

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Silver nanoparticles sintering at low temperature on a copper substrate: In situ characterization under inert atmosphere and air

Experimental Phase‐Diagram Study and Thermodynamic Optimization of the Silver‐Strontium‐Copper‐Oxygen (Ag‐Sr‐Cu‐O) and Silver‐Calcium‐Copper‐Oxygen (Ag‐Ca‐Cu‐O) Systems

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Thermodynamic assessment of the Ag-Cu-O system

Cited by 26 publications

References 13 publications

Quantitative Electron Microscopy of (Bi,Pb)2Sr2Ca2Cu3O10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Quantitative Electron Microscopy of (Bi,Pb)2Sr2Ca2Cu3O10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Silver nanoparticles sintering at low temperature on a copper substrate: In situ characterization under inert atmosphere and air

Experimental Phase‐Diagram Study and Thermodynamic Optimization of the Silver‐Strontium‐Copper‐Oxygen (Ag‐Sr‐Cu‐O) and Silver‐Calcium‐Copper‐Oxygen (Ag‐Ca‐Cu‐O) Systems

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Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing