Elaboration et caracterisation de monocristaux de V 2O 3 par transport en phase vapeur

Abstract

Single crystals of V 2O 3 are obtained by HCl or TeCl 4 chemical transport method in sealed quartz tubes with temperature gradients of 1050–930°C and 990–900°C respectively. The hexagonal prims are 5 mm long and 1 or 2 mm wide. Both kinds of crystals are characterized by sharp insulator-metal transition at 156 and 137 K respectively, they present a large hysteresis. The sharp decrease in resistivity with increasing temperature is of the order of 10 8 at the transition.