Phase Transitions in Ag₈SnSe₆ and Ag₈SnS₆: Mössbauer and X-ray Study

Editorial Board PCSS Journal; M. V. Chekailo; S. I. Yushchuk; S. O. Yuryev; L. G. Akselrud; V. V. Mokliak

doi:10.15330/pcss.26.4.774-780

Authors

M. V. Chekailo National University ‘‘Lviv Polytechnic”, Department of Physics, Lviv, Ukraine
S. I. Yushchuk National University ‘‘Lviv Polytechnic”, Department of Physics, Lviv, Ukraine
S. O. Yuryev National University ‘‘Lviv Polytechnic”, Department of Physics, Lviv, Ukraine
L. G. Akselrud Ivan Franko National University of Lviv, Department of Inorganic Chemistry, Lviv, Ukraine
V. V. Mokliak G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine; Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.26.4.774-780

Keywords:

argyrodite, canfieldite, phase transitions, superionic conductors

Abstract

The structural transformations accompanying the low-temperature phase transition (PT) β´→γ in the argyrodite Ag₈SnSe₆ characterized by mixed electron-ionic conductivity, have been studied using nuclear gamma resonance (NGR) and X-ray diffraction (XRD). Parallel Mössbauer studies were performed on the structurally related canfieldite Ag₈SnS₆. An abrupt decrease in the probability of the Mössbauer effect and isomer shifts was observed in argyrodite and canfieldite near 356 K and 445 K, respectively, corresponding to phase transitions in these compounds. Spatial models of the first and second coordination spheres of Ag₈SnSe₆ in the β´ and γ-modifications have been proposed.

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