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Abstract
Brillouin spectroscopy was used to study the elastic properties of glycinium phosphite (GPI) and deuterated glycinium phosphite (DGPI) crystals. The temperature measurements of the hypersonic velocity for acoustic modes propagating in various directions have been performed in the temperature range 170 K-300 K and 295 K-355 K for GPI and DGPI, respectively. Brillouin study has confirmed the existence of the order-disorder type ferroelectric phase transition (P21/a - P21) at 224 K for GPI and 322 K for DGPI. The obtained results are also discussed in terms of the reordering of the hydrogen bonds in the ferroelectric phase.
