Homogeneity range of ternary 11-type chalcogenides Fe1 + yTe1−xSex

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Homogeneity Range of Ternary 11-Type Chalcogenides Fe1 + y Te1−x Se x.pdf (1.45 MB)

Date

2017

Authors

Koz, C.
Rößler, S.
Wirth, S.
Schwarz, U.

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Source Title

Journal of Superconductivity and Novel Magnetism

Print ISSN

1557-1939

Electronic ISSN

1557-1947

Publisher

Springer

Volume

30

Issue

7

Pages

2001 - 2006

Language

English

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Article

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Abstract

The 11-type Fe-chalcogenides belong to the family of Fe-based superconductors. In these compounds, the interstitial Fe is known to strongly influence the magnetic and superconducting properties. Here, we present the chemical homogeneity range of ternary compounds Fe1 + yTe1−xSex based on powder x-ray diffraction, energy dispersive x-ray analysis, and magnetization measurements. Our investigations show that the maximum amount of excess Fe in homogeneous Fe1 + yTe1−xSex decreases with increase in Se substitution for Te. Using our synthesis procedure, single-phase Fe1 + yTe1−xSex, with 0.5 ≤ x < 1 could not be formed for any amount of excess Fe. Further, the superconducting volume fraction in the material is found to be strongly suppressed by excess Fe.

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Keywords

Fe-based superconductors , Fe-chalcogenides , Ternary phase diagram , Chalcogenides , Chemical analysis , Chemical compounds , Energy dispersive x-ray analysis , Inorganic compounds , Superconducting materials , Ternary alloys , X ray analysis , X ray diffraction , Chemical homogeneity , Magnetization measurements , Powder x-ray diffraction , Superconducting properties , Superconducting volume , Synthesis procedure , Iron compounds

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http://hdl.handle.net/11693/37466

Published Version (Please cite this version)

http://dx.doi.org/10.1007/s10948-016-3632-x

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Scholarly Publications - UNAM