S. I. Sadovnikov, A. V. Chukin, A. A. Rempel, A. I. Gusev, “Polymorphic transformation in nanocrystalline silver sulfide”, Fizika Tverdogo Tela, 2016, Volume 58, Issue 1,Pages <nobr>32

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Semiconductors

Polymorphic transformation in nanocrystalline silver sulfide

S. I. Sadovnikov^a, A. V. Chukin^b, A. A. Rempel^ab, A. I. Gusev^a

^a Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg
^b Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg

Abstract: The $\alpha$-Ag$_{2}$S acanthite–$\beta$-Ag$_{2}$S 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 $\sim$449–450 K, and its enthalpy is $\sim$3.7–3.9 kJ mol$^{-1}$. The thermal expansion coefficients of acanthite and argentite have been estimated.

Keywords: Polymorphic Transformation, Linear Thermal Expansion Coefficient, Thiocarbamide, Silver Sulfide, Acanthite.

Received: 23.06.2015