High-temperature X-ray diffraction and thermal expansion of nanocrystalline and coarse-crystalline acanthite α-Ag2S and argentite β-Ag2S

Physical Chemistry Chemical Physics : PCCP
S I SadovnikovA A Rempel

Abstract

An in situ study of thermal expansion of polymorphic phases of coarse-crystalline and nanocrystalline silver sulfide - monoclinic acanthite α-Ag2S and cubic argentite β-Ag2S - has been carried out for the first time using the high-temperature X-ray diffraction method. The temperature dependencies of the unit cell parameters of acanthite and argentite in the interval of 300-623 K have been determined, and the thermal expansion coefficients of acanthite and argentite have been found. It is shown that the observed difference in the thermal expansion coefficients for nano- and coarse-crystalline acanthite is due to the small particle size of nanocrystalline silver sulfide leading to the growth of anharmonicity of atomic vibrations. It is established by differential thermal analysis that a reversible polymorphic acanthite-argentite phase transformation takes place at ∼449-450 K and the phase transformation enthalpy is equal to ∼3.7-3.9 kJ mol(-1).

References

Apr 29, 2015·Physical Chemistry Chemical Physics : PCCP·S I SadovnikovA A Rempel

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Citations

Nov 9, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Maciej DębowskiZbigniew Florjańczyk
Jun 2, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Tanmoy Das
Nov 15, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·K F Kelton
Jun 2, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·P SzańkowskiŁ Cywiński
Jun 15, 2020·Photochemistry and Photobiology·Bhanu PrakashAshok Kumar Ganguli
Sep 16, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ismail HamdiStéphane Aloïse
May 18, 2016·Nanoscale·C LutzT Chikyow
Nov 4, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Karishma BhardwajSudarsan Tamang
Jan 22, 2021·Physical Chemistry Chemical Physics : PCCP·S I Sadovnikov, A I Gusev

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