Proton motion in paraelastic phase for Rb3H(SeO4)(2)

The proton dynamics along the c axis (the c(h) axis) in the high-conductive phase for Rb3H(SeO4)(2) was investigated by the CW NMR analysis. It was fo und that the proton NMR line shape at room temperature was described in Gau ssian currie hut that it was described in the summation of the Gaussian and Lorentzian curves in the high-conductive phase. Moreover, the NMR line wid th in the high-conductive phase became 10 times narrower than that at room temperature. These results indicated that protons moved along the c(h) axis in high-conductive phase. Furthermore; the dynamics of the protons along t he c(h) axis was made clear from calculating the second and forth moments. From this result, it was found that protons move disorderedly along the c(h ) axis between quasi-stable positions which exist between neighboring SeO4 ions.