| Autor: |
Pogodin, Artem, Filep, Mykhailo, Malakhovska, Tetyana, Vakulchak, Vasyl, Komanicky, Vladimir, Vorobiov, Serhii, Izai, Vitalii, Satrapinskyy, Leonid, Shender, Iryna, Bilanych, Vitaliy, Kokhan, Oleksandr, Kúš, Peter |
| Zdroj: |
Ionics; Jun2024, Vol. 30 Issue 6, p3339-3356, 18p |
| Abstrakt: |
Powders of Ag7(Si1-xGex)S5I (x = 0.2, 0.4, 0.6, 0.8) solid solutions were obtained via ball milling for 30 and 60 min. SEM analysis revealed a relatively narrow particle size distribution, with an average particle size of approximately 150 nm (30 min) and 100 nm (60 min). Phase analysis approves the formation of solid solutions and the absence of any destruction during the ball milling. Dense ceramic disks of Ag7(Si1-xGex)S5I solid solutions were fabricated by cold pressing followed by annealing. The ceramic chemical homogeneity was approved by EDS, and the average crystallite size resulting from the recrystallization process was determined by SEM. The frequency and temperature dependence of the electrical conductivity were studied using the EIS method. It was established that Ag7(Si1-xGex)S5I-based ceramic materials are mixed conductors with a significant predominance of ionic conductivity. The compositional dependence of ionic conductivity and its activation energy is non-monotonous. The highest ionic conductivity is observed for Ag7Si0.8Ge0.2S5I (6.88 × 10−2 S cm−1) and Ag7Si0.2Ge0.8S5I (8.05 × 10−2 S cm−1) ceramics. Also, the impact of the initial particle size of powders, ceramic microstructure, and isovalent Si+4 → Ge+4 cationic substitution on the electrical parameters of Ag7(Si1-xGex)S5I solid solutions is discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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