Paper Title
Magnetic properties in Bi2Se3 Bulk system

Abstract
Polycrystalline bulk samples of Bi2 (Se1-xTex)3system with 0≤x≤0.9 were prepared by the conventional melting method. All compounds show a metal-semiconductor conductivity transition, and the conductivity of the pristine Bi2Se3 compound increases with the low Te doping ratio (x=0.3) then decreases monotonically for further amounts. The magnetic measurements show a ferromagnetic behavior at low temperatures in all composites, this is asserted by the hysteresis loops at 60K that exhibit a proportional relation between the coercive field and the Te ratio. The Seebeck coefficient of Bi2Se3 compound is positive showing up the p-type conduction. However, introducing Te increases the n-type conduction with a decrease in the Seebeck coefficient absolute value. In addition, Bi2Se3 compound is found to exhibit high room temperature power factor and figure of merit values of 16.4 μW/cm.k2and 10.61, respectively, due to the relatively high Seebeck coefficient & electrical conductivity and the low thermal conductivity.