A new Gly . H3PO3 crystal. was grown and its physical properties were
investigated. DSC measurements revealed a phase transition at about 22
4 K. Dielectric investigations showed a large anomaly of dielectric pe
rmittivity at 224.7 K along the b-axis. The appearance of spontaneous
polarization (along the b-axis) observed by means of a Sawyer-Tower ci
rcuit gives evidence for a para-ferroelectric phase transition in this
material.