The van der Waals Ferromagnets Fe5–δGeTe2 and Fe5–δ–xNixGeTe2 – Crystal Structure, Stacking Faults, and Magnetic Properties

Fe5–δGeTe2 was synthesized by heating the elements at 1050 K and characterized by single crystal and powder X‐ray analysis. The structure [R3m, a = 4.0376(4) Å, c = 29.194(6) Å] consists of Fe5–δGe layers separated by tellurium double layers forming a van der Waals gap. The pronounced two‐dimensiona...

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Bibliographic Details
Published in:Zeitschrift für anorganische und allgemeine Chemie (1950) 2018-12, Vol.644 (24), p.1923-1929
Main Authors: Stahl, Juliane, Shlaen, Evgeniya, Johrendt, Dirk
Format: Article
Language:English
Subjects:
Crystal structure
Dilution
Domains
Ferromagnetism
Iron
Magnetic measurement
Magnetic properties
Magnetism
Saturation
Single crystals
Solid‐phase synthesis
Stacking faults
Structure elucidation
Tellurium
Van der Waals ferromagnets
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Summary:Fe5–δGeTe2 was synthesized by heating the elements at 1050 K and characterized by single crystal and powder X‐ray analysis. The structure [R3m, a = 4.0376(4) Å, c = 29.194(6) Å] consists of Fe5–δGe layers separated by tellurium double layers forming a van der Waals gap. The pronounced two‐dimensional character of Fe5–δGeTe2 causes stacking faults along the c direction. Simulations of different stacking variants using the DIFFaX software reveal disorder occurring in domains. Magnetic measurements of Fe5–δGeTe2 show ferromagnetism below 279 K with a saturation moment of 1.80 μB at 1.8 K. Nickel substitution of the iron sites has little influence on the structure but changes the saturation moment, which passes through a maximum of 2.11 μB in Fe4.11Ni0.50GeTe2. This indicates that structural influences as well as the dilution of the magnetic iron atoms play a decisive role.
ISSN:0044-2313
1521-3749
DOI:10.1002/zaac.201800456