Magnetic Topological Insulators Nano-Crystallites Fe1.4Bi0.6Se2.5Y0.5Prx: Preparation, Characterization and Physical Properties

Abstract

Magnetic topological insulators novel nano-crystallites Fe1.4Bi0.6Se2.5Y0.5Prx (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 Fe1.4Bi0.6Se3Y 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 (Fe1.4Bi0.6Se2.5Y0.5). Also, the ratio of the weight loss was about (8%) of the sample indicating high thermal stability of the Fe1.4Bi0.6Se2.5Y0.5Prx. In addition, magnetic moment-field dependence confirmed additive of Pr3+-ions exhibited the transitions from antiferromagnetic to paramagnetic states. Dielectric-dependence temperature and frequency results confirmed the doping of Pr3+-ions exhibited the transition between insulator/semiconductor states. The finding data shows improvement of the engineering properties of the Fe1.4Bi0.6Se2.5Y0.5Prx composition for microelectronics application.