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The acoustic behaviour of (NH 4 ) 4 H 2 (SeO 4 ) 3 single crystal around the superionic phase transition at 378 K was studied by Brillouin scattering measurements. No anomaly of the longitudinal mode in the [100] direction was observed whereas 5% softening of the longitudinal mode with a minimum at 382 K was found in the [001] direction. The possible symmetry...
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