Reactivity in the system copper/arsenic/sulfur. II. The formation of CuAsS, (lautite)

Autor(en): Muller, A
Blachnik, R
Stichwörter: Chemistry; Chemistry, Inorganic & Nuclear; COPPER; copper arsenic sulfides; CU-AS-S; FORM; lautite; MECHANOCHEMICAL SYNTHESES; PHASE; SELENIDES; solid state reactions; SULFOSALTS
Erscheinungsdatum: 2003
Herausgeber: WILEY-V C H VERLAG GMBH
Journal: ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Volumen: 629
Ausgabe: 10
Startseite: 1833
Seitenende: 1838
Zusammenfassung: 
The reaction pathways during the synthesis of CuAsS have been studied with the DTA in the range 25 - 8 10 degreesC with a heating rate of 10 K/min. Educts, intermediates, and products were characterized by X-ray diffraction at room and elevated temperatures. Educts were the corresponding elements and the binary compounds As4S4, As2S3, Cu3-xAs, Cu5-6As2, Cu2S, and CuS. The 13 examined educt mixtures can be divided into four groups specified by their thermal effects observed during the reaction. Mixtures of group I contain copper arsenides and arsenic sulfides, those of group 11 and III arsenic and copper sulfides, and arsenic sulfides and copper, respectively. Group IV includes mixtures showing individual reactions. In all cases the reaction to CuAsS proceeds stepwise. The reaction is not completed at 574 degreesC, the decomposition temperature of CuAsS, because the product is still associated with Cu12+xAs4+yS13, As, and to a lesser amount with Cu1.81S. Nevertheless, a consecutive run in which the samples were heated above the liquidus temperature shows no exothermic reaction effect. When the mixtures were cooled at 10 K/min after the runs, no CuAsS was found in the X-ray experiments. Only Cu12+xAs4+yS13 and As were then observed.
ISSN: 00442313
DOI: 10.1002/zaac.200300116

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