- Tytuł:
- Superionic Phase Transition in Rb$\text{}_{4}$LiH$\text{}_{3}$(SeO$\text{}_{4}$)$\text{}_{4}$ Single Crystals
- Autorzy:
-
Połomska, M.
Hilczer, B.
Wolak, J.
Pietraszko, A. - Powiązania:
- https://bibliotekanauki.pl/articles/1931312.pdf
- Data publikacji:
- 1994-05
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
61.50.Em
62.20.Dc
77.22.Gm - Opis:
- Derivatographic, dielectric and complex impedance studies of Rb$\text{}_{4}$LiH$\text{}_{3}$(SeO$\text{}_{4}$)$\text{}_{4}$ crystals revealed a superionic phase transition at T$\text{}_{s}$ ≈ 448 K. The bulk conductivity rises from 10$\text{}^{-6}$ to 10$\text{}^{-4}$ (Ωm)$\text{}^{-1}$ at T$\text{}_{s}$, and the activation energy of conductivity in the direction of crystal axes a and b (where a = b for tetragonal symmetry) W$\text{}_{a}$ = W$\text{}_{b}$ decreases from 0.94 eV in the low temperature phase to the value of 0.27 eV at T > T$\text{}_{s}$. The analysis of the results of X-ray studies at room temperature and at 450 K indicates that the fast ion transport, characterized by low activation energy, is related to the delocalization of the H2 protons in the O(12)-H2-O(24) bonds linking the Se(1)O$\text{}_{4}$ and Se(2)O$\text{}_{4}$ tetrahedra. The "cogwheel" mechanism is suggested to be involved in the fast proton transport.
- Źródło:
-
Acta Physica Polonica A; 1994, 85, 5; 825-833
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł