Scientific Library of Tomsk State University

   Digital catalogue        

Novel ternary layered manganese bismuth tellurides of the MnTe-Bi2Te3 system: Synthesis and crystal structure Z. S. Aliev, I. R. Amiraslanov, D. I. Nasonova [et al.]

Contributor(s): Amiraslanov, Imamaddin R | Nasonova, Daria I | Shevelkov, Andrei V | Abdullayev, Nadir A | Jahangirli, Zakir A | Orujlu, Elnur N | Otrokov, Mikhail M | Mamedov, Nazim T | Babanly, Mahammad B | Aliev, Ziya S | Chulkov, Evgueni VMaterial type: ArticleArticleSubject(s): рамановская спектроскопия | фазовые диаграммы | кристаллическая структура | слоистые теллуриды | дифракция рентгеновских лучей | марганец | висмутGenre/Form: статьи в журналах Online resources: Click here to access online In: Journal of alloys and compounds Vol. 789. P. 443-450Abstract: 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 °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)·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+.
Tags from this library: No tags from this library for this title. Log in to add tags.
No physical items for this record

Библиогр.: 48 назв.

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 °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)·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+.

There are no comments on this title.

to post a comment.
Share