Cation mobility in the Cu6PS5X (X=Cl,Br, I) argyrodites |
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| Affiliation: | 1. Uzhhorod National University, Pidgirna Street 46, Uzhhorod, 88000, Ukraine;2. Ferenc Rákóczi II Transcarpathian Hungarian Institute, Kossuth Sq. 6, Beregovo, 90200, Ukraine;3. P.J. Šafarik University, Institute of Physics, Faculty of Science, Park Angelinum 9, 04154, Kosice, Slovakia;4. Comenius University, Mlynska dolina, Bratislava, 84248, Slovakia;1. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States;2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States;1. Uzhhorod National University, Pidgirna Street 46, Uzhhorod 88000, Ukraine;2. Ferenc Rákóczi II Transcarpathian Hungarian College of Higher Education, Kossuth Sq. 6, Beregovo 90200, Ukraine;3. Comenius University, Mlynska dolina, Bratislava 84248, Slovakia |
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| Abstract: | The electrical conductivity of Cu6PS5Cl shows purely Arrhenius behavior throughout the temperature range 170–450 K with no evidence of the 241 K thermodynamic phase transition previously reported. Cu6PS5Br exhibits two changes in activation energy. The first, at 251 K, apparently coincides with a previously determined thermodynamic transition. The second, at 321 K, is likely associated with a conduction transformation from ionic to electronic. The conductivity of Cu6PS5I is characterized by a cusp at a temperature of 194 K, far removed from a previously reported thermodynamic transition at 221 K. In addition, a broad and continuous change in activation energy appears to coincide with another previously reported phase transition at 270 K. |
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