Structure Relations and XRD Patterns of the Disorder-Order Transition of Metastable RE2TM17 Alloys


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By using non-equilibrium methods and subsequent annealing, rare-earth transitionΠmetal-alloys with the nominal chemical composition 2:17 show a hexagonal metastable TbCu7 like structure. This disordered hexagonal (P6/mmm) metastable compound can be represented by a rhombohedral cell by using a cell transition of the hexagonal space group P6/mmm into the translationsgleiche subgroup P -31m (162) and subsequently into the klassengleiche subgroup II b R -3m. The atomic positions of the obtained rhombohedral cell correspond to appropriate coordinates in the hexagonal cell. In that way, a partial order of the 2:17 structure can be described. For the binary system Sm-Fe, a compound with similar structure and the formula SmFe8.5 exists. Examples are given for the obtained phases after ball milling the elemental powders Fe and Sm and subsequent annealing, and also after HDDR of Sm2Fe17.



Materials Science Forum (Volumes 443-444)

Edited by:

Yvonne Andersson, Eric J. Mittemeijer and Udo Welzel




A. Teresiak, "Structure Relations and XRD Patterns of the Disorder-Order Transition of Metastable RE2TM17 Alloys", Materials Science Forum, Vols. 443-444, pp. 271-276, 2004

Online since:

January 2004





[1] M. Katter, J. Wecker and L. Schultz: J. Appl. Phys. Vol. 70 (1991), p.3188.

[2] P.A. P. Wendhausen, B. Gebel, N.M. Dempsey, K. -H. Müller and J.M.D. Coey: Proceedings of the 13th International Workshop on Rare-Earth Magnets and their Applications, Birmingham (1994), p.831.

[3] A.H. Morrish, Z.W. Li, X.Z. Zhou and S. Dai: J. Phys. D: Appl. Phys. Vol. 29 (1996), p.2290.

[4] A. Hasebe and E. Otsuki: Mat. Transact. JIM Vol. 37 (1996), p.870.

[5] F.E. Pinkerton and C.D. Fuerst: Appl. Phys. Lett. Vol. 60 (1992), p.2558.

[6] K. Schnitzke, L. Schultz, J. Wecker and M. Katter: Appl. Phys. Lett. Vol. 57 (1990), p.2853.

[7] K.H.J. Buschow and A. S. van der Goot: Acta Cryst. Vol. B27 (1971), p. (1985).

[8] A. Teresiak, M. Kubis, N. Mattern, M. Wolf and K. -H. Müller: J. Alloys Comp. Vol. 274 (1998), p.284.

[9] A. Teresiak, O. Gutleisch, N. Mattern, B. Gebel and K. -H. Müller: J. Alloys Comp. Vol. 346 (2002), p.235.

[10] Th. Hahn (Ed. ): International Tables for Crystallography: Vol. A (Dordrecht, Boston, London, 1989).

[11] E. Parthé, L. Gelato, B. Chabot, M. Penzo, K. Cenzual and R. Gladyshevskii: TYPIX, Standardized Data and Crystal Chemical Characterization of Inorganic Structure Types in Gmelin Handbook of Inorganic and Organometallic Chemistry Vol. 4 (Springer, Berlin 1994) p.1405.