| Autor: |
Baklanova, Ya. V., Buzlukov, A. L., Fedorov, D. S., Denisova, T. A., Tyutyunnik, A. P., Savina, A. A., Khaikina, E. G., Arapova, I. Yu. |
| Zdroj: |
Russian Journal of Inorganic Chemistry; Jun2022, Vol. 67 Issue 6, p772-779, 8p |
| Abstrakt: |
Cationic transport in triple molybdate Na25Cs8Sc5(MoO4)24 with an alluaudite structure has been studied. According to 23Na NMR, the ion jump frequency is as high as ~ 104‒105 s–1 at Т = 550‒600 K, and the activation energy for sodium diffusion is Ea ~ 0.9 eV. The mobility of Na+ ions is slower than that found in double molybdate Na5Sc(MoO4)4, which is caused by structural features. In Na25Cs8Sc5(MoO4)24, some of sodium positions are replaced by Cs+ ions preventing the sodium diffusion in a channel along the c axis. As a result, the 2D mechanism of Na+ transport typical of the Na5R(MoO4)4 alluaudite family does not occur. The most probable mechanism of sodium diffusion in Na25Cs8Sc5(MoO4)24 involves successive atomic jumps along a zigzag path in the ab plane. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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