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Issue 12, 2018
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A comprehensive structural and microstructural investigation of a new iron–telluride nano phase

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Abstract

A nanocrystalline iron-rich telluride, Fe5Te4, was prepared mechanochemically using ball milling procedures in an inert atmosphere, starting from FexTe powder mixtures with x = 1.0, 1.25 and 1.5, with x = 1.25 leading to the pure phase. Its crystal structure has a tetragonal (I4/m) symmetry and shows an anomalously short Fe–Fe interaction of 2.52 Å. The microstructure of the nanocrystalline material was deeply studied by synchrotron X-ray total scattering techniques and the Debye scattering equation (DSE) method. A DSE-based microstrain model, integrated with structure, size and morphology information, indicates the presence of highly strained nanoparticles, with strain more preferentially accumulated in the ab-plane than along the c-axis of the tetragonal structure. Magnetic and Mössbauer spectroscopic characterization indicates that the samples present a spin glass state below the freezing temperature (ca. 150 K) and a magnetic behavior dependent on the applied field, showing ferromagnetic-like loops and a superparamagnetic-like increase of magnetization up to the maximum applied field of 90 kOe.

Graphical abstract: A comprehensive structural and microstructural investigation of a new iron–telluride nano phase

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Article information


Submitted
28 Nov 2017
Accepted
19 Feb 2018
First published
21 Feb 2018

J. Mater. Chem. C, 2018,6, 3047-3057
Article type
Paper

A comprehensive structural and microstructural investigation of a new iron–telluride nano phase

K. F. Ulbrich, F. Bertolotti, N. Masciocchi, A. Cervellino, A. Guagliardi and C. E. M. Campos, J. Mater. Chem. C, 2018, 6, 3047
DOI: 10.1039/C7TC05456D

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