Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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R.A.Shakhovoy, V.Sarou-Kanian, A.Rakhmatullin, E.Véron, C.Bessada, 'High-temperature nuclear magnetic resonance study of phase transition kinetics in LiNaSO4', J. Appl. Phys. 118 243906 (2015) doi:10.1063/1.4939075

A new high-temperature NMR technique for measurements of the phase transition kinetics in solids has been developed. The technique allows measuring the time evolution of the volume of the appearing phase at controlled cooling rates. Developed method was applied to study the phase transition kinetics in the superionic conductor LiNaSO4. It was revealed that the phase transition in LiNaSO4 is governed by the diffusion-controlled growth of nuclei (“germs”). An effect of the crystallite rearrangement in the LiNaSO4 powder after cooling through the phase transition was also revealed. This effect was studied by means of high-temperature XRD and NMR.