Abstract
Abstract The relaxation times of the 1 H and 133 Cs nuclei in CsH 3 (SeO 3 ) 2 crystals were investigated using FT NMR. The 133 Cs spectrum does change from seven resonance lines to one resonance line near T m (=350 K). The presence of only one 133 Cs signal is due to the liquid state resulting from the melting of the crystal. The variation in the separation of the 133 Cs resonance lines with temperature indicates that the EFG at the Cs sites produced by the (SeO 3 ) 2− groups varies with temperature, which in turn means that the atoms neighboring 133 Cs are displaced. And, the T 1 for 133 Cs is very long and undergoes significant changes near T m . The change in the temperature dependence of T 1 at T m for the 133 Cs nuclei coincides with the melting temperature. These results are compared with those obtained for MH 3 (SeO 3 ) 2 (M=Na, K, and Cs) crystals.
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