authors |
Checca, NR; Caraballo-Vivas, RJ; Coelho, AA; Rossi, A; Fortunato, NM; Mohseni, F; Goncalves, JN; Amaral, JS; Rocco, DL; Reis, MS |
nationality |
International |
journal |
MATERIALS & DESIGN |
author keywords |
Nanoparticles; Pulsed laser deposition; Heusler alloys; Structural change |
keywords |
SENSITIZED SOLAR-CELLS; MATERIALS SCIENCE; PHOTOANODE |
abstract |
Full Heusler alloys are well known to either crystallize in a cubic structure (Cu2MnAl-type), or present tetragonal distortions. Both structure types present interesting properties, like room temperature magnetic memory shape effect and/or remarkable magnetocaloric effect, mainly ruled by strong magnetostructural coupling. Due to this interplay, our aim was to produce a new crystal phase for the Heusler alloys, different from those well-established cubic and tetragonal, responsible for those well-known physical properties. Thus, we have produced nanoparticles of full Heusler alloys using a pulsed laser deposition technique (from targets of Fe2MnSi) and obtained a core-shell pattern, presenting an amorphous shell and a crystalline core, with hexagonal symmetry. In accordance with these experimental findings, it was shown, by means of density functional calculation, the existence of a minimum of energy as a function of the hexagonal lattice parameters, with a true indication that the hexagonal phase is metastable. The magnetic properties differ considerably from those of bulk Fe2MnSi, including an increase of the Curie temperature from 220 K to 295 K, which is of potential interest for room-temperature applications. This work opens the door to research in a new family of materials, whose properties have only now begun to be explored. (C) 2018 Elsevier Ltd. All rights reserved. |
publisher |
ELSEVIER SCI LTD |
issn |
0264-1275 |
year published |
2018 |
volume |
143 |
beginning page |
268 |
ending page |
273 |
digital object identifier (doi) |
10.1016/j.matdes.2018.01.062 |
web of science category |
Materials Science, Multidisciplinary |
subject category |
Materials Science |
unique article identifier |
WOS:000425879300029
|
ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
6.289 |
5 year journal impact factor |
6.214 |
category normalized journal impact factor percentile |
81.369 |
dimensions (citation analysis):
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altmetrics (social interaction):
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