Phase equilibria in the SnBi2Te4MnBi2Te4 system and characterization of the Sn1-xMnxBi2Te4 solid solutions

E Orujlu

doi:10.15330/pcss.21.1.113-116

Abstract

The phase diagram of the SnBi2Te4-MnBi2Te4 system was established over the entire concentration range by means of differential thermal analysis and powder X-ray diffraction techniques. It was shown that the system is non-quasi-binary due to the incongruent melting character of SnBi2Te4 and MnBi2Te4 compounds, but it is stable below solidus. The formation of a continuous series of solid solutions with the tetradymite-like layered structure was observed. Due to ionic radius differences of Mn2+ and Sn2+, both unit cell parameters of solid solutions increase linearly with the increasing amount of Sn. Phase equilibria above the solidus curve cannot be completed until the SnTe-MnTe-Bi2Te3 system fully studied.

Highlights

Bismuth and antimony based layered chalcogenides are desirable novel materials for the future development of low-power electronic and spintronic devices as topological insulators since they are new states of quantum matter which both theoretically predicted and experimentally observed in some layered tetradymite type structured compounds, in particular (AIV = Mn, Ge, Sn, Pb; AV = Sb, Bi; BVI = Se, Te) systems 1-6
We investigate phase equilibria in the
Increasing x results of a slight shift of peaks to high angles arising from ionic radius differences which is characteristical for substitutional solid solutions

Summary

Vasyl Stefanyk Precarpathian National University

The phase diagram of the SnBi2Te4 MnBi2Te4 system was established over the entire concentration range by means of differential thermal analysis and powder X-ray diffraction techniques. It was shown that the system is non-quasi-binary due to the incongruent melting character of SnBi2Te4 and MnBi2Te4 compounds, but it is stable below solidus. The formation of a continuous series of solid solutions with the tetradymite-like layered structure was observed. Due to ionic radius differences of Mn2+ and Sn2+, both unit cell parameters of solid solutions increase linearly with the increasing amount of Sn. Phase equilibria above the solidus curve cannot be completed until the SnTe MnTe Bi2Te3 system fully studied. Keywords SnBi2Te4 MnBi2Te4 system, phase equilibria, solid solutions, tetradymite-like structure, topological insulator

Introduction

Results and discussion

Conclusion