| Full text | |
| Author(s): |
Bormio-Nunes, C.
[1]
;
Paduani, C.
[2]
;
dos Santos, C. T.
[1]
;
Izario Fo, H. J.
[1]
;
Coelho, A. A.
[3]
;
Ghivelder, L.
[4]
Total Authors: 6
|
| Affiliation: | [1] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil
[2] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC - Brazil
[3] Univ Estadual Campinas, UNICAMP, Inst Fis, BR-13083970 Campinas, SP - Brazil
[4] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Journal of Alloys and Compounds; v. 553, p. 233-238, MAR 15 2013. |
| Web of Science Citations: | 2 |
| Abstract | |
We investigate the magnetostriction of polycrystalline Fe-100 V-x(x) alloys as a function of vanadium content, with values of x varying from 5.2% to 40.7% (at.%V). The lattice parameter curve behavior as a function of vanadium deviates from a linear behavior at x approximate to 10.2 and x approximate to 30.7. Close to x = 10.2 is possible to observe a small lattice contraction and close to x = 30.7 an expansion. The magnetostriction curve as a function of vanadium content shows two maxima at x = 11.8 and 30.7 and has values of 3/2 lambda(s) of 68.8 ppm and 49.3, respectively. The alloys microstructures investigations do not offer enough elements to connect it with magnetostriction. Therefore first-principles calculations were performed and resulted that the lattice contraction at similar to 0.2% of V is due to the formation of strengthened Fe-V interactions associated to stronger hybridization between minority spin d subbands, while the lattice expansion observed in the range 25.5-30.7% of V is associated to the weakening of the Fe-V interaction. As for the case of simulating V-V pairs for the alloy Fe12V4, representative of x = 25.0, we associated the experimental result of the lattice expansion observed in the range among 25.5-30.7% of V to the weakening of the Fe-V interaction. These calculated electronic properties explain the lattice contraction (at x = 10.2) and expansion (x = 25.5-30.7) and are expected to be the sources of the magnetostrictive behavior of these Fe-V alloys. (C) 2012 Elsevier B. V. All rights reserved. (AU) | |
| FAPESP's process: | 09/54001-2 - Acquisition of cryogen-free equipment for the characterization of magnetic properties by vibrating sample magnetometry |
| Grantee: | Carlos Alberto Moreira dos Santos |
| Support Opportunities: | Multi-user Equipment Program |