Thermal Analyses of Silver-Based Sulfosalts in Air

Fiseha Tesfaye; Daniel Lindberg

doi:10.1007/978-3-319-51580-9_6

Thermal Analyses of Silver-Based Sulfosalts in Air

Kestävän tulevaisuuden teknologiat

Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussa › Luku › Tieteellinen › vertaisarvioitu

1 Sitaatiot (Scopus)

Abstrakti

The sulfosalts Ag _0.93Cu _1.07S (stromeyerite) and α-AgBiS ₂ (schapbachite) have been studied under oxidizing conditions at elevated temperatures. The sulfosalts were synthesized from the pure simple sulfides in evacuated quartz ampoules. The synthesized samples were thermally analyzed in the temperature range from 298 to 1173 K by a simultaneous DTA-TGA analyzer . Based on the DTA measurements the phase transition of stromeyerite to the solid solution (Cu, Ag) ₂S(hcp) in air is determined to be T = (360.9 ± 2) K. For the first time, maximum thermal stability of (Ag, Cu) ₂S in an oxidizing atmosphere close to the partial pressure of oxygen in air ( P(O ₂) ≈ 0.20 atm) is determined to be below T = (614 ± 2) K, above which it oxidizes to form Ag, CuO and Ag ₂SO ₄. The melting temperature of Ag ₂SO ₄ determined from the cooling DTA curve, T = (932.76 ± 2) K, is in good agreement with the literature value. Below T = 1173 K, the oxidation process for schapbachite in air has been indirectly determined to be: 2AgBiS ₂ + 5.5O ₂(g) ⇄ 2Ag + Bi ₂O ₃ + 4SO ₂(g).

Alkuperäiskieli	Ei tiedossa
Otsikko	Materials Processing Fundamentals 2017
Toimittajat	Antoine Allanore, Guillaume Lambotte, Jonghyun Lee
Kustantaja	Springer
Sivut	55–64
ISBN (elektroninen)	978-3-319-51580-9
ISBN (painettu)	978-3-319-51579-3
DOI - pysyväislinkit	https://doi.org/10.1007/978-3-319-51580-9_6
Tila	Julkaistu - 2017
OKM-julkaisutyyppi	A3 Kirjan osa tai toinen tutkimuskirja

Keywords

Optimization
Oxidation/Reduction
Silver
Sustainability
sulfosalts
sulphides

Pääsy asiakirjaan

10.1007/978-3-319-51580-9_6

https://www.springerprofessional.de/en/thermal-analyses-of-silver-based-sulfosalts-in-air/12047420

Viittausmuodot

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abstract = "The sulfosalts Ag 0.93Cu 1.07S (stromeyerite) and α-AgBiS 2 (schapbachite) have been studied under oxidizing conditions at elevated temperatures. The sulfosalts were synthesized from the pure simple sulfides in evacuated quartz ampoules. The synthesized samples were thermally analyzed in the temperature range from 298 to 1173 K by a simultaneous DTA-TGA analyzer . Based on the DTA measurements the phase transition of stromeyerite to the solid solution (Cu, Ag) 2S(hcp) in air is determined to be T = (360.9 ± 2) K. For the first time, maximum thermal stability of (Ag, Cu) 2S in an oxidizing atmosphere close to the partial pressure of oxygen in air ( P(O 2) ≈ 0.20 atm) is determined to be below T = (614 ± 2) K, above which it oxidizes to form Ag, CuO and Ag 2SO 4. The melting temperature of Ag 2SO 4 determined from the cooling DTA curve, T = (932.76 ± 2) K, is in good agreement with the literature value. Below T = 1173 K, the oxidation process for schapbachite in air has been indirectly determined to be: 2AgBiS 2 + 5.5O 2(g) ⇄ 2Ag + Bi 2O 3 + 4SO 2(g).",

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N2 - The sulfosalts Ag 0.93Cu 1.07S (stromeyerite) and α-AgBiS 2 (schapbachite) have been studied under oxidizing conditions at elevated temperatures. The sulfosalts were synthesized from the pure simple sulfides in evacuated quartz ampoules. The synthesized samples were thermally analyzed in the temperature range from 298 to 1173 K by a simultaneous DTA-TGA analyzer . Based on the DTA measurements the phase transition of stromeyerite to the solid solution (Cu, Ag) 2S(hcp) in air is determined to be T = (360.9 ± 2) K. For the first time, maximum thermal stability of (Ag, Cu) 2S in an oxidizing atmosphere close to the partial pressure of oxygen in air ( P(O 2) ≈ 0.20 atm) is determined to be below T = (614 ± 2) K, above which it oxidizes to form Ag, CuO and Ag 2SO 4. The melting temperature of Ag 2SO 4 determined from the cooling DTA curve, T = (932.76 ± 2) K, is in good agreement with the literature value. Below T = 1173 K, the oxidation process for schapbachite in air has been indirectly determined to be: 2AgBiS 2 + 5.5O 2(g) ⇄ 2Ag + Bi 2O 3 + 4SO 2(g).

AB - The sulfosalts Ag 0.93Cu 1.07S (stromeyerite) and α-AgBiS 2 (schapbachite) have been studied under oxidizing conditions at elevated temperatures. The sulfosalts were synthesized from the pure simple sulfides in evacuated quartz ampoules. The synthesized samples were thermally analyzed in the temperature range from 298 to 1173 K by a simultaneous DTA-TGA analyzer . Based on the DTA measurements the phase transition of stromeyerite to the solid solution (Cu, Ag) 2S(hcp) in air is determined to be T = (360.9 ± 2) K. For the first time, maximum thermal stability of (Ag, Cu) 2S in an oxidizing atmosphere close to the partial pressure of oxygen in air ( P(O 2) ≈ 0.20 atm) is determined to be below T = (614 ± 2) K, above which it oxidizes to form Ag, CuO and Ag 2SO 4. The melting temperature of Ag 2SO 4 determined from the cooling DTA curve, T = (932.76 ± 2) K, is in good agreement with the literature value. Below T = 1173 K, the oxidation process for schapbachite in air has been indirectly determined to be: 2AgBiS 2 + 5.5O 2(g) ⇄ 2Ag + Bi 2O 3 + 4SO 2(g).

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KW - Oxidation/Reduction

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