Magnetostriction of Fe100-xVx alloys for 5.2 <= x <= 40.7

Autor(es)

Bormio-Nunes, C. ^[1] ; Paduani, C. ^[2] ; dos Santos, C. T. ^[1] ; Izario Fo, H. J. ^[1] ; Coelho, A. A. ^[3] ; Ghivelder, L. ^[4]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 553, p. 233-238, MAR 15 2013.
• Citações Web of Science: 2

Resumo

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)

• Processo FAPESP: 09/54001-2 - EMU: aquisição de equipamento cryo-free para caracterização de propriedades magnéticas por magnetometria de amostra vibrante (VSM)
• Beneficiário: Carlos Alberto Moreira dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 04/09779-1 - Obtenção de ligas Fe1-xGex e caracterização de suas propriedades microestruturais e magnetostrictivas
• Beneficiário: Cristina Bormio Nunes
• Modalidade de apoio: Auxílio à Pesquisa - Regular