A study of the phase transitions and proton dynamics of the superprotonic conductor Cs{sub 5}H{sub 3}(SO{sub 4}){sub 4}.0.5H{sub 2}O single crystal with {sup 1}H and {sup 133}Cs nuclear magnetic resonance
- Department of Science Education, Jeonju University, Jeonju 560-759 (Korea, Republic of), E-mail: aeranlim@hanmail.net
The phase transitions and proton dynamics of Cs{sub 5}H{sub 3}(SO{sub 4}){sub 4}.0.5H{sub 2}O single crystals were studied by measuring the NMR line shape, the spin-lattice relaxation time, T{sub 1}, and the spin-spin relaxation time, T{sub 2}, of the {sup 1}H and {sup 133}Cs nuclei. The 'acid' protons and the 'water' protons in Cs{sub 5}H{sub 3}(SO{sub 4}){sub 4}.0.5H{sub 2}O were distinguished. The loss of water protons was observed above T{sub C1}, whereas the content of water protons was found to recover above T{sub C2}. Therefore, the water protons play a special role in the stability of the superprotonic phase at high temperatures. The mechanism of fast proton conduction was found to consist of hydrogen-bond proton transfer involving the breakage of the weak part of the hydrogen bond and the formation of a new hydrogen bond. Thus, these structural phase transitions probably involve significant reorientation of the SO{sub 4} tetrahedra and dynamical disorder of the hydrogen bonds between them. - Graphical abstract: The phase transitions and proton dynamics of Cs{sub 5}H{sub 3}(SO{sub 4}){sub 4}.0.5H{sub 2}O were studied by the spin-lattice relaxation time and the spin-spin relaxation time of the {sup 1}H and {sup 133}Cs nuclei. The 'acid' and the 'water' protons were distinguished. Our NMR study has provided new information about the roles of acid protons, water protons, and cesium nuclei in Cs{sub 5}H{sub 3}(SO{sub 4}){sub 4}.0.5H{sub 2}O single crystals. Display Omitted Fig. Temperature dependences of T{sub 1} and T{sub 2} for acid and water protons in a Cs{sub 5}H{sub 3}(SO{sub 4}){sub 4}.H{sub 2}O single crystal ({center_dot}: T{sub 1} and {open_square}: T{sub 2} for acid proton, o: T{sub 1} and {open_square}: T{sub 2} for water proton)
- OSTI ID:
- 21128249
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 4; Other Information: DOI: 10.1016/j.jssc.2008.01.011; PII: S0022-4596(08)00027-3; Copyright (c) 2008 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
Similar Records
Structure and vibrational spectrum of {beta}-Cs{sub 3}(HSO{sub 4}){sub 2}[H{sub 2{minus}x}(P{sub 1{minus}x}, S{sub x})O{sub 4}](x{approximately}0.5), a new superprotonic conductor, and a comparison with {alpha}-Cs{sub 3}(HSO{sub 4}){sub 2}(H{sub 2}PO{sub 4})
A comparison of the interaction of nitric oxide with the heteropolytungstic acids H{sub 3}PW{sub 12}O{sub 40}, H{sub 0.5}Cs{sub 2.5}PW{sub 12}O{sub 40}, HMgPW{sub 12}O{sub 40}, H{sub 8}SiW{sub 11}O{sub 38}, H{sub 4}SiW{sub 12}O{sub 40}, and H{sub 10}CoW{sub 12}O{sub 42}