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|Type:||Artigo de periódico|
|Title:||Magnetostriction of Fe100-xVx alloys for 5.2 <= x <= 40.7|
dos Santos, CT
|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.|
|Editor:||Elsevier Science Sa|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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