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Layered manganese bismuth tellurides with GeBi4Te7- and GeBi6Te10-type structures: towards multifunctional materials

Souchay, Daniel and Nentwig, Markus and Günther, Daniel and Keilholz, Simon and de Boor, Johannes and Zeugner, Alexander and Isaeva, Anna and Ruck, Michael and Wolter, Anja UB and Büchner, Bernd and Oeckler, Oliver (2019) Layered manganese bismuth tellurides with GeBi4Te7- and GeBi6Te10-type structures: towards multifunctional materials. Journal of Materials Chemistry C. Royal Society of Chemistry. DOI: 10.1039/C9TC90227A ISSN 2050-7526

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Abstract

The crystal structures of new layered manganese bismuth tellurides with the compositions Mn0.85(3)Bi4.10(2)Te7 and Mn0.73(4)Bi6.18(2)Te10 were determined by single-crystal X-ray diffraction, including the use of microfocused synchrotron radiation. These analyses reveal that the layered structures deviate from the idealized stoichiometry of the 12P-GeBi4Te7 (space group P[3 with combining macron]m1) and 51R-GeBi6Te10 (space group R[3 with combining macron]m) structure types they adopt. Modified compositions Mn1−xBi4+2x/3Te7 (x = 0.15–0.2) and Mn1−xBi6+2x/3Te10 (x = 0.19–0.26) assume cation vacancies and lead to homogenous bulk samples as confirmed by Rietveld refinements. Electron diffraction patterns exhibit no diffuse streaks that would indicate stacking disorder. The alternating quintuple-layer [M2Te3] and septuple-layer [M3Te4] slabs (M = mixed occupied by Bi and Mn) with 1 : 1 sequence (12P stacking) in Mn0.85Bi4.10Te7 and 2 : 1 sequence (51R stacking) in Mn0.81Bi6.13Te10 were also observed in HRTEM images. Temperature-dependent powder diffraction and differential scanning calorimetry show that the compounds are high-temperature phases, which are metastable at ambient temperature. Magnetization measurements are in accordance with a MnII oxidation state and point at predominantly ferromagnetic coupling in both compounds. The thermoelectric figures of merit of n-type conducting Mn0.85Bi4.10Te7 and Mn0.81Bi6.13Te10 reach zT = 0.25 at 375 °C and zT = 0.28 at 325 °C, respectively. Although the compounds are metastable, compact ingots exhibit still up to 80% of the main phases after thermoelectric measurements up to 400 °C.

Item URL in elib:https://elib.dlr.de/130596/
Document Type:Article
Title:Layered manganese bismuth tellurides with GeBi4Te7- and GeBi6Te10-type structures: towards multifunctional materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Souchay, DanielInstitute for Mineralogy, Crystallography and Materials Science, Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
Nentwig, MarkusInstitute for Mineralogy, Crystallography and Materials Science, Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
Günther, DanielInstitute for Mineralogy, Crystallography and Materials Science, Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
Keilholz, SimonInstitute for Mineralogy, Crystallography and Materials Science, Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
de Boor, JohannesGerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
Zeugner, AlexanderFaculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, GermanyUNSPECIFIED
Isaeva, AnnaInstitute of Solid State Physics, Technische Universität Dresden, 01062 Dresden, GermanyUNSPECIFIED
Ruck, MichaelFaculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, GermanyUNSPECIFIED
Wolter, Anja UBLeibniz-Institute for Solid State and Materials Research, Helmholtzstr. 10, 01069 Dresden, GermanyUNSPECIFIED
Büchner, BerndInstitute of Solid State Physics, Technische Universität Dresden, 01062 Dresden, Germany and Leibniz-Institute for Solid State and Materials Research, Helmholtzstr. 10, 01069 Dresden, GermanyUNSPECIFIED
Oeckler, OliverInstitute for Mineralogy, Crystallography and Materials Science, Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
Date:19 July 2019
Journal or Publication Title:Journal of Materials Chemistry C
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1039/C9TC90227A
Publisher:Royal Society of Chemistry
ISSN:2050-7526
Status:Published
Keywords:Manganese bismuth tellurides; GeBi4Te7- and GeBi6Te10-type structures
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:15 Nov 2019 15:20
Last Modified:15 Nov 2019 15:20

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