Applied Physics A

, 124:269 | Cite as

Unusual effects of manual grinding and subsequent annealing process observed in Gd5.09Ge2.03Si1.88 compound

  • A. M. G. Carvalho
  • C. S. Alves
  • P. V. Trevizoli
  • A. O. dos Santos
  • S. Gama
  • A. A. Coelho
Article
  • 44 Downloads

Abstract

The Gd5.09Ge2.03Si1.88 compound, as well as other magnetocaloric materials, certainly will not be used in their un-manufactured as-cast condition in future magnetic refrigeration applications or other devices. In this work, we have studied the Gd5.09Ge2.03Si1.88 compound processed in different ways, mainly, the as-cast powder, the annealed powder, and the pressed and sintered powder. The annealed powder (1370 K/20 h) does not present the monoclinic phase and the first-order magneto-structural transition observed in the as-cast powder. The pressed and sintered powder also do not present the first-order transition. Furthermore, the compacting pressure shifts the second-order magnetic transition to lower temperatures. The behavior of cell parameters as a function of the compacting pressure indicates that TC is directly affected by parameter c change.

Notes

Acknowledgements

The authors thank financial support from Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP and Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq.

References

  1. 1.
    V.K. Pecharsky, K.A. Gschneidner Jr., Phys. Rev. Lett. 78, 4494 (1997)ADSCrossRefGoogle Scholar
  2. 2.
    V.K. Pecharsky, K.A. Gschneidner Jr., Appl. Phys. Lett. 70, 3299 (1997)ADSCrossRefGoogle Scholar
  3. 3.
    A.O. Pecharsky, K.A. Gschneidner Jr., V.K. Pecharsky, C.E. Schindler, J. Alloys Compd. 338, 126 (2002)CrossRefGoogle Scholar
  4. 4.
    C.S. Alves, S. Gama, A.A. Coelho, E.J.R. Plaza, A.M.G. Carvalho, L.P. Cardoso, A.C. Persiano, Mater. Res. 7, 535 (2004)CrossRefGoogle Scholar
  5. 5.
    J.H. Belo, A.M. Pereira, J. Ventura, G.N.P. Oliveira, J.P. Araújo, P.B. Tavares, L. Fernandes, P.A. Algarabel, C. Magen, L. Morellon, M.R. Ibarra, J. Alloys Compd. 529, 89 (2012)CrossRefGoogle Scholar
  6. 6.
    S. Gama, C.S. Alves, A.A. Coelho, C.A. Ribeiro, A.I.C. Persiano, D. Silva, J. Magn. Magn. Mater. 272, 848 (2004)ADSCrossRefGoogle Scholar
  7. 7.
    M.J.M. Pires, A.M.G. Carvalho, S. Gama, E.C. da Silva, A.A. Coelho, A.M. Mansanares, Phys. Rev. B 72, 224435 (2005)ADSCrossRefGoogle Scholar
  8. 8.
    M.J.M. Pires, A.M. Mansanares, E.C. da Silva, A.M.G. Carvalho, S. Gama, A.A. Coelho, Phys. Rev. B 73, 144404 (2006)ADSCrossRefGoogle Scholar
  9. 9.
    A.O. Guimarães, M.E. Soffner, A.M. Mansanares, A.A. Coelho, A.M.G. Carvalho, M.J.M. Pires, S. Gama, E.C. da Silva, Phys. Rev. B 80, 134406 (2009)ADSCrossRefGoogle Scholar
  10. 10.
    A.O. Guimarães, M.E. Soffner, A.M. Mansanares, A.A. Coelho, A.M.G. Carvalho, M.J.M. Pires, S. Gama, E.C. da Silva, J. Appl. Phys. 107, 073524 (2010)ADSCrossRefGoogle Scholar
  11. 11.
    P.V. Trevizoli, C.S. Alves, M.A.B. Mendes, A.M.G. Carvalho, S. Gama, J. Magn. Magn. Mater. 320, 1582 (2008)ADSCrossRefGoogle Scholar
  12. 12.
    A.O. Pecharsky, K.A. Gschneidner Jr., V.K. Pecharsky, J. Appl. Phys. 93(8), 4722 (2003)ADSCrossRefGoogle Scholar
  13. 13.
    W. Wu, A.O. Tsokol, K.A. Gschneidner Jr., J.A. Sampaio, J. Alloys Compd. 403, 118 (2005)CrossRefGoogle Scholar
  14. 14.
    F. Canepa, S. Cirafici, M. Napoletano, J Alloy Compd. 335, L1–L4 (2002)CrossRefGoogle Scholar
  15. 15.
    H. Fu, Y. Chen, M. Tu, T. Zhang, Acta Mater. 53, 2377–2383 (2005)CrossRefGoogle Scholar
  16. 16.
    A.M.G. Carvalho, C.S. Alves, A. de Campos, A.A. Coelho, S. Gama, F.C.G. Gandra, P.J. von Ranke, N.A. de Oliveira, J. Appl. Phys. 97, 10M320 (2005)CrossRefGoogle Scholar
  17. 17.
    L. Morellon, Z. Arnold, P.A. Algarabel, C. Magen, M.R. Ibarra, Y. Skorokhod, J. Phys. Condens. Matter 16, 1623 (2004)ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratório Nacional de Luz Síncrotron (LNLS)Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)CampinasBrazil
  2. 2.Departamento de Engenharia MecânicaUEMMaringáBrazil
  3. 3.Centro de Ciências Sociais, Saúde e TecnologiaUFMAImperatrizBrazil
  4. 4.Departamento de Ciências Exatas e da TerraUNIFESPDiademaBrazil
  5. 5.Instituto de Física Gleb WataghinUNICAMPCampinasBrazil

Personalised recommendations