An in situ high-temperature scanning electron microscopy study of acanthite–argentite phase transformation in nanocrystalline silver sulfide powder

Literature Information

Publication Date 2015-07-24
DOI 10.1039/C5CP02499D
Impact Factor 3.676
Authors

S. I. Sadovnikov, A. I. Gusev


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Abstract

For the first time, the α-Ag2S (acanthite)–β-Ag2S (argentite) phase transformation in nanocrystalline and coarse-crystalline powders of silver sulfide has been observed in situ by the scanning electron microscopy method in real-time. The argentite crystals are formed on the surface of acanthite particles as a result of electron-beam heating. According to the differential thermal analysis data, the transformation occurs at a temperature of ∼449–450 K, and the enthalpy of transformation is equal to ∼3.7–3.9 kJ mol−1. The presence of α-Ag2S (acanthite)–β-Ag2S (argentite) phase transformation is confirmed in situ by high-temperature X-ray diffraction data.

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