ELECTRICAL-PROPERTIES OF ZIRCONIUM DISELENIDE SINGLE-CRYSTALS GROWN BY IODINE TRANSPORT METHOD

Single crystals of zirconium diselenide (ZrSe2) were grown by chemical vapour transport method using iodine as the transporting agent. The c rystals were found to exhibit metallic behaviour in the temperature ra nge 77-300 K and semiconducting nature in 300-443 K range. The measure ments of thermoelectric power and conductivity enabled the determinati on of both carrier mobility and carrier concentration. The variation o f carrier mobility and carrier concentration with temperature indicate s the presence of deep trapping centres and their reduction with tempe rature in these crystals.