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Velocities of Longitudinal and Transverse Elastic Vibrations in Superionic Silver Sulfide

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Abstract

It has been shown that the heat capacity of argentite β-Ag2S, which is nanocrystalline superionic silver sulfide, includes an additional positive contribution caused by the existence of the lower and upper bounds of the phonon spectrum because of a small size of particles. The estimate of this contribution from experimental data on the difference of the heat capacities of nano- and coarse-crystalline argentite β-Ag2S in the region of its existence 470–850 K makes it possible to determine for the first time the velocities of propagation of longitudinal and transverse elastic oscillations cl and ct and the elastic rigidity constants c11, c12, and c44. It has been found that an increase in the temperature results in a decrease in the elastic characteristics of argentite. The directions of the crystal lattice of argentite corresponding to the maximum and minimum elastic moduli have been determined.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990, Russia

    S. I. Sadovnikov

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  1. S. I. Sadovnikov
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Correspondence to S. I. Sadovnikov.

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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 3, pp. 203–208.

Funding

This work was supported by the Russian Science Foundation (project no. 19-79-10101) and was performed at the Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences (Yekaterinburg, Russia).

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Sadovnikov, S.I. Velocities of Longitudinal and Transverse Elastic Vibrations in Superionic Silver Sulfide. Jetp Lett. 112, 193–198 (2020). https://doi.org/10.1134/S0021364020150096

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