Thermal expansion of nanocrystalline and coarse-crystalline silver sulfide Ag2S


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In situ studies of the thermal expansion of polymorphic phases of coarse-crystalline and nanocrystalline silver sulfide, namely, monoclinic acanthite α-Ag2S and cubic argentite β-Ag2S, have been performed for the first time by high-temperature X-ray diffraction. The temperature dependences of the unit cell parameters of acanthite and argentite have been measured from temperatures in the range of 300–623 K, and the thermal expansion coefficients of acanthite and argentite have been determined. The observed difference between the thermal expansion coefficients of nano- and coarse-crystalline acanthite is shown to be due to a small size of nanocrystalline silver sulfide particles, which leads to an increase in the anharmonicity of atomic vibrations.

作者简介

A. Gusev

Institute of Solid State Chemistry

编辑信件的主要联系方式.
Email: gusev@ihim.uran.ru
俄罗斯联邦, ul. Pervomaiskaya 91, Yekaterinburg, 620990

S. Sadovnikov

Institute of Solid State Chemistry

Email: gusev@ihim.uran.ru
俄罗斯联邦, ul. Pervomaiskaya 91, Yekaterinburg, 620990

A. Chukin

Ural Federal University

Email: gusev@ihim.uran.ru
俄罗斯联邦, ul. Mira 19, Yekaterinburg, 620990

A. Rempel

Institute of Solid State Chemistry; Ural Federal University

Email: gusev@ihim.uran.ru
俄罗斯联邦, ul. Pervomaiskaya 91, Yekaterinburg, 620990; ul. Mira 19, Yekaterinburg, 620990

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