Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 789, Issue -, Pages 443-450Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.03.030
Keywords
Phase diagram; Crystal growth; X-ray diffraction; Crystal structure; Layered manganese bismuth tellurides; Raman spectroscopy
Categories
Funding
- Science Development Foundation [EIF-BGM-4-RFTF-1/2017-21/04/1]
- Russian Foundation for Basic Research [18-53-06002, 18-52-06009]
- Saint Petersburg State University [15.61.202.2015]
- Tomsk State University [8.1.01.2018]
- Spanish Ministry of Science and Innovation [FIS 2016-75862-P]
- Azerbaijan State Oil and University [ASOIU-2018-1-05]
Ask authors/readers for more resources
It is shown that MnTe-Bi2Te3 system is quasi-binary and in fact hosts three intermediate phases. Along with already known MnBi2Te4 phase, another two, MnBi4Te7 and MnBi6Te10 have been found to exist. All the phases melt incongruently in a very narrow temperature range of 577-590 degrees C via peritectic reactions. Directional crystal growth results in hetero-phase ingots due to the narrow compositional range and narrow primary crystallization fields. The crystal structure of each phase is a derivation of the prototype tetradymit-type layered structure and the phases constitute a new homologous series with the chemical formula (MnTe)center dot n(Bi2Te3). X-ray diffraction patterns and Raman spectroscopy of the sorted-out single phase samples show that different phases have different number of the seven (7)- and five (5)-layer blocks and their different stacking manner in the unit cell. In particular, MnBi2Te4 exhibits the -7-7-7-, MnBi4Te7 -5-7-5-7-, and MnBi6Te10 -5-5-7-5-5-7- sequence of the blocks. Thus, these structures are the first derivatives of Bi2Te3 structure to contain a transition metal cation Mn2+. (C) 2019 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available