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Persistence of 5:3 plates in RE5(SixGe1-x)4 alloys

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Abstract

Studies of RE5(SixGe1-x)4 alloys, where RE equals rare earth, have revealed a second-phase having a thin-plate morphology in essentially every alloy examined, independent of exact composition and matrix crystal structure. Identified as having a composition approximating Gd5(SixGe1-x)3 and a hexagonal crystal structure in the Gd-based system, it has been suggested that the observed thin-plate second phases seen in this family of rare earth alloys are all most likely of the form RE5(SixGe1-x)3. A number of interesting observations suggest that the formation of these second-phase plates is somewhat unusual. The purpose of this article is to investigate the stability of this second phase in Gd- and Er-based compounds. The stability was investigated as a function of thermal cycling and large-scale composition fluctuations. The results of scanning and transmission electron microscopy (SEM, TEM) studies indicate that the RE5(SixGe1-x)3 phase is extremely stable once it forms in a RE5(SixGe1-x)4 matrix.

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References

  1. L. Morellon, J. Blasco, P.A. Algarabel, M.R. Ibarra: Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compounds Gd5(SixGe1-x)4. Phys. Rev. B 62, 1022 (2000).

    Article  CAS  Google Scholar 

  2. L. Morellon, P.A. Algarabel, M.R. Ibarra, J. Blasco, B. Garcia-Landa, Z. Arnold, F. Albertini: Magnetic-field-induced structural phase transition in Gd5(Si1.8Ge2.2). Phys. Rev. B 58, R14721 (1998).

    Article  CAS  Google Scholar 

  3. E.M. Levin, V.K. Pecharsky, K.A. Gschneidner Jr.: Magnetic-field and temperature dependencies of the electrical resistance near the magnetic and crystallographic first-order phase transition of Gd5(Si2Ge2). Phys. Rev. B 60, 7993 (1999).

    Article  CAS  Google Scholar 

  4. E.M. Levin, V.K. Pecharsky, K.A.J Gschneidner, P. Tomlinson: Magnetic field and temperature-induced first-order transition in Gd5 (Si1.5Ge2.5): A study of the electrical resistance behavior. J. Magn. Magn. Mater. 210, 181 (2000).

    Article  CAS  Google Scholar 

  5. L. Morellon, J. Stankiewicz, B. Garcia-Landa, P.A. Algarabel, M.R. Ibarra: Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2). Appl. Phys. Lett. 73, 3462 (1998).

    Article  CAS  Google Scholar 

  6. V.K. Pecharsky, K.A. Gschneidner Jr.: Giant magnetocaloric effect in Gd5(Si2Ge2). Phys. Rev. Lett. 78, 4494 (1997).

    Article  CAS  Google Scholar 

  7. V.K. Pecharsky, K.A. Gschneidner Jr.: Phase relationships and crystallography in the pseudobinary system Gd5Si4–Gd5Ge4. J Alloys Compd. 260, 98 (1997).

    Article  CAS  Google Scholar 

  8. O. Ugurlu, L.S. Chumbley, D.L. Schlagel, T.A. Lograsso, A.O. Pecharsky: Characterization of R5(SixGe1-x)4 alloys, where R is Gd, Tb, Dy and Er: TMS Light Metals (134th TMS Annual Meeting, San Francisco, CA, 2005), p. 1181.

    Google Scholar 

  9. O. Ugurlu, L.S. Chumbley, D.L. Schlagel, T.A. Lograsso, A.O. Tsokol: Identification of thin plates seen in R5(SixGe1-x)4 alloys, where R is Gd, Tb, Dy, and Er. Scripta Mater. 55, 373 (2005).

    Article  Google Scholar 

  10. J.S. Meyers, L.S. Chumbley, F. Laabs, A.O. Pecharsky: Determination of phases in as prepared Gd5(SixGe1-x)4 where x = 1/2. Scripta Mater. 47, 509 (2002).

    Article  CAS  Google Scholar 

  11. J. Szade, G. Skorek, A. Winiarski: Surface structure of Gd5(Si,Ge)4 crystals. J. Cryst. Growth 205, 289 (1999).

    Article  CAS  Google Scholar 

  12. O. Ugurlu, L.S. Chumbley, T.A. Lograsso, D.L. Schlagel: Characterization of an atypical Widmanstatten structure in Gd5Si3Ge2 alloys. Acta Mater. 53, 3525 (2005).

    Article  CAS  Google Scholar 

  13. O. Ugurlu, L.S. Chumbley, D.L. Schlagel, T.A. Lograsso: On the formation of atypical Widmanstaetten plates in the Gd5(Si2Ge1-x)4 system. Acta Mater. 54, 1211 (2005).

    Article  Google Scholar 

  14. Y. Mozharivskyj, A.O. Pecharsky, V.K. Pecharsky, G.J. Miller: On the high-temperature phase transition of Gd5Si2Ge2. J. Am. Chem. Soc. 127, 317 (2005).

    Article  CAS  Google Scholar 

  15. Ames Laboratory Materials Preparation Center (MPC), Ames, IA.

  16. S.P. Luzan, V.E. Listovnichii, Y.I. Buyanov, P.S. Martsenyuk: Phase diagram of the binary erbium-silicon system and physical properties of erbium silicides up to 1050 °C. J. Alloys Compd. 239, 77 (1996).

    Article  CAS  Google Scholar 

  17. V.K. Pecharsky, K.A. Gschneidner: Gd5(SixGe1-x)4: An extremum material. Adv. Mater. 13, 683 (2001).

    Article  CAS  Google Scholar 

  18. O. Ugurlu, L.S. Chumbley, D.L. Schlagel, T.A. Lograsso: On the formation of atypical Widmanstaetten plates in the Gd5(Si2Ge1-x)4 system. Acta Mater. 54, 1211 (2006).

    Article  CAS  Google Scholar 

  19. J.S. Meyers, S. Chumbley, F. Laabs, A.O. Pecharsky: TEM analysis of Gd5(SixGe1-x)4, where x = 1/2. Acta Mater. 51, 61 (2003).

    Article  CAS  Google Scholar 

  20. J.S. Meyers, L.S. Chumbley, W. Choe, G.J. Miller: Microstructural analysis of twinned b-Gd5Si2Ge2. Phys. Rev. B 66, 012106 (2002).

    Article  Google Scholar 

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Iowa State University, Ames, Iowa, 50011, USA

    O. Ugurlu, L. S. Chumbley & C. R. Fisher

  2. Ames Laboratory (DOE), Iowa State University, Ames, Iowa, 50011-3020, USA

    O. Ugurlu, L. S. Chumbley & C. R. Fisher

Authors
  1. O. Ugurlu
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  2. L. S. Chumbley
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  3. C. R. Fisher
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Correspondence to O. Ugurlu.

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Ugurlu, O., Chumbley, L.S. & Fisher, C.R. Persistence of 5:3 plates in RE5(SixGe1-x)4 alloys. Journal of Materials Research 21, 2669–2674 (2006). https://doi.org/10.1557/jmr.2006.0326

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  • DOI: https://doi.org/10.1557/jmr.2006.0326

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