Abstract
Abstract Cationic self-diffusion in the ionic plastic phases of TlNO2 and TlNO3 was investigated by measuring temperature dependences of the 203,205Tl NMR spin-lattice relaxation time and the electrical conductivity. The NMR results snowed that the Tl+ ions in these phases undergo rapid translational diffusion with the activation energy (Ea) of 48 and 77 kJ mol−1 for nitrite and nitrate, respectively. The Ea values agreed well with those obtained from the electrical conductivity, indicating that the cation is the electric carrier. The diffusion constants (D) estimated from the relaxation time and conductivity data were ca. 10−12 m2 s−1 at the respective melting point (Tm) of plastic phase. The tendency that D at Tm has the characteristic value given above is recognized for other ionic plastic phases so far reported. The Tl+ ionic conductivity in TlSCN, which makes no plastic phase, was reported in comparison.
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