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

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DOI

  • K. F. Ulbrich, Universidade Federal de Santa Catarina , Brazil
  • F. Bertolotti
  • N. Masciocchi, Total Scattering Laboratory, University of Insubria, Italy
  • A. Cervellino, Paul Scherrer Institut, Switzerland
  • A. Guagliardi, Total Scattering Laboratory, Consiglio Nazionale delle Ricerche, Italy
  • C. E. M. Campos, Universidade Federal de Santa Catarina , Brazil

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 angstrom. 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 Mossbauer 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.

Original languageEnglish
JournalJournal of Materials Chemistry C
Volume6
Issue12
Pages (from-to)3047-3057
Number of pages11
ISSN2050-7526
DOIs
Publication statusPublished - 2018

    Research areas

  • POWDER DIFFRACTION PATTERNS, SWISS LIGHT-SOURCE, THERMODYNAMIC PROPERTIES, NANOPARTICLES, NANOCRYSTALS, SUPERCONDUCTIVITY, SYSTEM, COTE2, SHAPE, FESE

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