Abstract
Synthetic samples in the alpha phase at 550 degrees C and in the beta phase at 650 degrees C were studied with air and vacuum atmosphere and Pt foil electrodes. The electrical current variation was measured both during sweeping and final cooling, giving activation energies in the alpha and beta phase. The samples were characterized by IR measurements at 77 K: a complete disappearance of the OH lines was observed after vacuum sweeping in the alpha phase (550 degrees C-3500 V/cm) or in the beta phase (650 degrees C-1500 V/cm). Considerable modification of the birefringence variations within the incommensurate phase was found. Samples that are heated in the beta phase become twinned; however, a torque can detwin the major part of a AT-cut twinned sample. >
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