Magnetic Topological Insulators Nano-Crystallites Fe 1.4 Bi 0.6 Se 2.5 Y 0.5 Prx: Preparation, Characterization and Physical Properties

Abstract

Magnetic topological insulators novel nano-crystallites Fe 1.4 Bi 0.6 Se 2.5 Y 0.5 Pr x (x = 0.0, 0.1, 0.2 and 0.3) were prepared successfully by acidic Sol, at 600 °C. Gel technique. The XRD pattern shows the higher crystallinity similar to Fe 1.4 Bi 0.6 Se 3 Y nanostructure. SEM shows there is a combination of small and large nanoparticles in soft accumulation of the samples. The average particle nano-size is nearly 20 ∼ 100 nm. Thermal analysis shows there are a weight loss at 450 °C corresponding to the crystallization of pure parent compound (Fe 1.4 Bi 0.6 Se 2.5 Y 0.5 ). Also, the ratio of the weight loss was about (8%) of the sample indicating high thermal stability of the Fe 1.4 Bi 0.6 Se 2.5 Y 0.5 Pr x . In addition, magnetic moment-field dependence confirmed additive of Pr 3+ -ions exhibited the transitions from antiferromagnetic to paramagnetic states. Dielectric-dependence temperature and frequency results confirmed the doping of Pr 3+ -ions exhibited the transition between insulator/semiconductor states. The finding data shows improvement of the engineering properties of the Fe 1.4 Bi 0.6 Se 2.5 Y 0.5 Pr x composition for microelectronics application.