Publication date: 2022

DOI: 10.1007/s11581-022-04651-y

The paper presents the experimental results on ionic conductivity and chemical diffusion in nonstoichiometric nanocrystalline superionic materials NaxCu1.75S (x = 0.1, 0.15, 0.2, 25). High values of the coefficient of conjugated chemical diffusion of cations and electronic holes (1.1∙10−3 and 1.65∙10−3 cm2/s at 410 °C) were observed in the studied electron-ionic conductors Na0.10Cu1.75S and Na0.20Cu1.75S. Activation energies of the total ionic conductivity are measured as 0.30 and 0.40 eV for superionic Na0.10Cu1.75S and Na0.15Cu1.75S phases respectively. In the superionic phases, the measured values of the total ionic conductivity are 2.8, 1.5, and 2.0 S/cm for Na0.10Cu1.75S, Na0.15Cu1.75S, and Na0.20Cu1.75S at 410 °C respectively. Thus, insertion of sodium to copper sulfide did not lead to worse of high ionic conductivity in the superionic phase. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

Издатель: Springer Science and Business Media Deutschland GmbH

Тип: Article