Electrical properties of copper- and silver-containing superionic (Cu1−xAgx)7SiS5I mixed crystals with argyrodite structure

• Published in: Solid state ionics Vol. 345; p. 115183
• Main Authors: Studenyak, I.P., Pogodin, A.I., Studenyak, V.I., Izai, V.Yu, Filep, M.J., Kokhan, O.P., Kranjčec, M., Kúš, P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-02-2020; Elsevier BV
• Subjects: Activation energy; Argyrodites; Bridgman method; Compositional dependence; Conductivity; Copper; Crystal growth; Crystal structure; Crystals; Electrical conductivity; Electrical properties; Electrical resistivity; Frequency ranges; Mixed crystals; Nyquist plot; Nyquist plots; Silver; Solidification; Crystal growth; Compositional dependence; Argyrodites; Nyquist plot; Electrical conductivity; Activation energy
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2019.115183

The copper and silver containing (Cu1−xAgx)7SiS5I mixed crystals with argyrodite structure have been grown by direct solidification using the Bridgman-Stockbarger technique. Measurements of electrical conductivity of mixed crystals by means of impedance spectroscopy were carried out in the frequency range from 2 × 101 Hz to 2 × 106 Hz and temperature range 292–378 K. Frequency dependences of total electrical conductivity were studied, Nyquist plots were constructed and analysed. The influence of Cu+ → Ag+ cation substitution on the total electrical conductivity, on the electronic and ionic components of the electrical conductivity as well as on their activation energies for (Cu1−xAgx)7SiS5I mixed crystals was investigated.
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•Impedance studies of (Cu1−xAgx)7SiS5I mixed crystals are carried out.•Temperature and frequency dependences of electric conductivity are measured.•Influence of cationic substitution on ionic and electronic conductivity is studied.