The Ag 2 S-Cu 2 S system

Suhr, N. H.

doi:10.2113/gsecongeo.50.3.347

Cited by 13 publications

(11 citation statements)

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“…Table 1 shows the chemical analysis results of product obtained at 180°C for 10 h determined by ICP analysis and it was confirmed that experimental silver and copper contents in samples were Ag0.89Cu1.10S. In previous reports about synthesis of the AgCuS using the conventional silica tube techniques, 13) the authors also presented the single phase of AgCuS was just obtained at the atomic ratio of Ag:Cu:S = 0.9:1.1:1, and if the atomic ratio of Ag:Cu:S is 1:1:1, a small amount of impurity, Ag3CuS2 was included in AgCuS. As reasons of these results, they interpreted that AgCuS has a defect structure with a deficiency of silver atoms or a structure in which some copper atoms occupy silver positions.…”

Section: Agcussupporting

confidence: 63%

“…AgCuS and Ag3CuS2 were prepared from stoichiometric mixture of Ag2S and Cu2S by using conventional silica tube techniques at 75°C for 72 h 12) and 277°C for 14 d 11) respectively. Moreover, AgCuS could also be prepared by a similar method from nonstoichiometric starting materials (Ag:Cu:S = 0.9:1.1:1) at 200°C for 12 d. 13) Considering these reports, AgCuS is a nonstoichiometric compound that has a wide composition width. 10) Therefore, it is critically interesting to know what kind of substance could be obtained by using hydrothermal process which is a different method as before.…”

Section: )-9)mentioning

confidence: 99%

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Syntheses of complex sulfides AgCuS and Ag3CuS2 from the elements under hydrothermal conditions

Tokuhara

Tezuka

Shan

et al. 2009

J. Ceram. Soc. Japan

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The hydrothermal technique was applied to the syntheses of ternary metal sulfides, AgCuS and Ag3CuS2, using silver, copper, and sulfur powders as starting materials. AgCuS was obtained as a single phase when the starting ratio of Ag:Cu:S was 0.9:1.1:1 in water above 120°C for 10 h except for synthesis condition at 120°C for 60 h and inductively coupled plasma (ICP) analysis revealed that experimental silver and copper contents in products were Ag0.89Cu1.10S. At 120°C for 60 h, some unidentified peaks were observed in the powder X-ray diffraction (XRD) pattern and plate crystals of new compound were found in addition to AgCuS particles from the field emission scanning electron microscopy (FE-SEM) image. Pure Ag3CuS2 was also prepared by a simple reaction of stoichiometric silver, copper, and sulfur powders above 90°C, and the composition of products was Ag2.99Cu1.00S.

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Section: Agcussupporting

confidence: 63%

Section: )-9)mentioning

confidence: 99%

Syntheses of complex sulfides AgCuS and Ag3CuS2 from the elements under hydrothermal conditions

Tokuhara

Tezuka

Shan

et al. 2009

J. Ceram. Soc. Japan

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“…The RT structure was described as zigzag chains of silver and sulfur atoms parallel to the c axis; the planes parallel to (001) are composed of layers of loosely packed face-centred silver atoms alternating with layers of triangularly coordinated sulfur and copper atoms [4,5]. Shortly thereafter, phase relations in the Cu-Ag-S system were studied by Djurle [6] and Skinner [7].…”

Section: Introductionmentioning

confidence: 99%

“…From the results presented in [4][5][6][7][8][9] a more detailed consideration of the high-temperature cubic modification of stromeyerite is recommended. Besides, more accurate in situ powder diffraction experiments on stromeyerite are required for further theoretical and experimental investigations of this highly disordered system.…”

Section: Introductionmentioning

confidence: 99%

High-temperature thermal expansion and structural behaviour of stromeyerite, AgCuS

Trots

Senyshyn

Mikhailova

et al. 2007

J. Phys.: Condens. Matter

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Results of simultaneous thermal analysis, synchrotron and neutron powder diffraction in the range from room temperature up to the melting point at 936 K on non-superionic orthorhombic β-AgCuS as well as on superionic hexagonal α-and cubic δ-AgCuS are reported. On heating the sample is only stable in argon. The following phase transitions occur in AgCuS at elevated temperatures:The volume changes at the superionic β −→ α and α −→ δ phase transitions are about 2.3 and 0.6%. The volume thermal expansion coefficients are 26 × 10 −6 , 130 × 10 −6 and 85 × 10 −6 K −1 for the pure β-, α-and δ-phases, respectively. Models for the average structures of α-and δ-AgCuS are proposed and discussed. Ionic conductivity in δ-AgCuS may originate from cation jumps in 'skewed' 100 directions between nearest-neighbour tetrahedral sites via the peripheries of the octahedral cavities. A correlation between the temperature dependence of the cation redistribution in δ-AgCuS and the temperature dependence of the ionic conductivity is assumed. A two-dimensional nature of the ionic conductivity due to cation jumps in slabs perpendicular to the c-direction is supposed for α-AgCuS. There is no evidence for ionic diffusion through the ( 1 2 , 1 2 , 1 2 ) site in 111 directions in either superionic α-or δ-phases.

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“…Interest focused both on its relation'. ;hip with argentite, Ag2S, and chalcocite, Cu2S, aad on its role as a silver-bearing mineral in silver-bearing copper ores (Schwartz, 1935;Suhr, 1955;Djurle, 1958). More recently CuAgS has been the subject of attention owing to its unusual physical properties.…”

Section: Introductionmentioning

confidence: 99%