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1994 | 85 | 5 | 825-833
Article title

Superionic Phase Transition in Rb_{4}LiH_{3}(SeO_{4})_{4} Single Crystals

Content
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Languages of publication
EN
Abstracts
EN
Derivatographic, dielectric and complex impedance studies of Rb_{4}LiH_{3}(SeO_{4})_{4} crystals revealed a superionic phase transition at T_{s} ≈ 448 K. The bulk conductivity rises from 10^{-6} to 10^{-4} (Ωm)^{-1} at T_{s}, and the activation energy of conductivity in the direction of crystal axes a and b (where a = b for tetragonal symmetry) W_{a} = W_{b} decreases from 0.94 eV in the low temperature phase to the value of 0.27 eV at T > T_{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_{4} and Se(2)O_{4} tetrahedra. The "cogwheel" mechanism is suggested to be involved in the fast proton transport.
Keywords
EN
Year
Volume
85
Issue
5
Pages
825-833
Physical description
Dates
published
1994-05
received
1993-11-30
(unknown)
1994-03-01
References
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv85z506kz
Identifiers
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