Dynamics of superionic Rb{sub 3}H(SeO{sub 4}){sub 2} single crystals studied by {sup 1}H and {sup 87}Rb spin-lattice relaxation
- Department of Science Education, Jeonju University, Jeonju 560-759, Chonbuk (Korea, Republic of)
- Division of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810 (Japan)
The {sup 1}H and {sup 87}Rb spin-lattice relaxation and spin-spin relaxation times in superionic Rb{sub 3}H(SeO{sub 4}){sub 2} single crystals grown by the slow evaporation method were measured over the temperature range 160-450 K. The temperature dependencies of the {sup 1}H T {sub 1}, T {sub 1} {sub {rho}} , and T {sub 2} are measured. In the ferroelastic phase, T {sub 1} differs from T {sub 1} {sub {rho}} , which is in turn different from T {sub 2}, although these three relaxation times converge to similar values near 410 K. This transition seems to occur at temperature which is about 40 K lower than the superionic transition temperature. The observation of liquid-like values of the {sup 1}H T {sub 1}, T {sub 1} {sub {rho}} , and T {sub 2} in the high temperature is compatible with the phase being superionic, indicating that the destruction and reconstruction of hydrogen bonds does indeed occur at high temperature. In addition, the {sup 87}Rb T {sub 1} and T {sub 2} values at high temperature were similar (on the order of milliseconds), a trend that was also observed for {sup 1}H T {sub 1} and T {sub 2}. This behavior is expected for most hopping-type ionic conductors, and could be attributed to interactions between the mobile ions and the neighboring group ions within the crystal. The motion giving rise to this liquid-like behavior is related to the superionic motion.
- OSTI ID:
- 20784839
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 1; Other Information: DOI: 10.1016/j.jssc.2005.10.009; PII: S0022-4596(05)00469-X; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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