Copper-enriched (Cu 0.75 Ag 0.25) 7 SiS 5 I-based ceramics were prepared from the micro-and nanopowders by pressing and sintering under developed technological conditions. Structural studies at different process step stages of ceramic samples preparation were performed using the XRD technique and microstructural analysis. The frequency and temperature dependences of the total electrical conductivity for (Cu 0.75 Ag 0.25) 7 SiS 5 I-based ceramics were investigated by the impedance measurements. From the Nyquist plots, by using the electrode equivalent circuits the ionic and electronic components of the total electrical conductivity were determined. It has been shown that both ionic and electronic conductivity nonlinearly depend on the average crystallites size of (Cu 0.75 Ag 0.25) 7 SiS 5 I-based ceramics.
Cu 1-х Ag x) 7 SiS 5 I mixed crystals were grown using the vertical zone crystallization method, they have been shown to crystallize in cubic structure (m F 3 4). The diffuse reflection spectra for the powders of (Cu 1-х Ag x) 7 SiS 5 I mixed crystals were measured at room temperature. Refractive indices and extinction coefficients for (Cu 1-х Ag x) 7 SiS 5 I mixed crystals were obtained from spectral ellipsometry measurements. A nonlinear decrease of the energy pseudogap and a nonlinear behavior with the maximum of refractive index have been revealed with increasing the Ag content. The dispersion of refractive indices of (Cu 1-х Ag x) 7 SiS 5 I has been described in the framework of different models.
(Cu0.25Ag0.75)7SiS5I-based superionic ceramics were fabricated by using the micro- and nanopowders. The XRD technique and microstructural analysis are applied for the structural studies of powders and ceramic samples. The impedance measurements of ceramic samples are carried out in the frequency range from 10Hz to 2 × 106 Hz and temperature interval from 292 K to 383 K. The contributions of ionic and electronic conductivities into the total electrical conductivity are determined, and their temperature dependences are investigated. The influence of the size effect on ionic and electronic conductivities and their activation energies in (Cu0.25Ag0.75)7SiS5I-based ceramics is studied.
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