Polymorphic transformation in nanocrystalline silver sulfide |
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| Authors: | S I Sadovnikov A V Chukin A A Rempel’ A I Gusev |
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| Institution: | 1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2. Ural Federal University, Yekaterinburg, Russia
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| Abstract: | The α-Ag2S acanthite–β-Ag2S argentite phase transformation in nanocrystalline silver sulfide has been studied in situ for the first time using high-temperature X-ray diffraction and scanning electron microscopy. The formation of argentite has been proved by differential thermal analysis. The acanthite–argentite transformation occurs at a temperature of ～449–450 K, and its enthalpy is ～3.7–3.9 kJ mol–1. The thermal expansion coefficients of acanthite and argentite have been estimated. |
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