An in situ high-temperature scanning electron microscopy study of acanthite-argentite phase transformation in
S I Sadovnikov1, A I Gusev, A A Rempel
1Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620990, Russia. gusev@ihim.uran.ru.
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.
