Growth of large-grain R-Mg-Zn quasicrystals from the
ternary melt (R = Y, Er, Ho, Dy and Tb)

I. R. Fisher, Z. Islam, A. F. Panchula, K. O. Cheon, M. J. Kramer*, P. C. Canfield, and A. I. Goldman

Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011.

* Ames Laboratory and Department of Material Science and Engineering, Iowa State University, Ames, Iowa 50011.

[Received 24 November 1997 and accepted November 1997]

The growth of large (up to 0.5 cm3), single-grain R-Mg-Zn quasicrystals (R = Y, Er, Ho, Dy and Tb) from a ternary melt is described in detail. The quasicrystals grown by this technique have a composition R8.7Mg34.6Zn56.8, are thermodynamically stable and have dodecahedral morphology with clearly visible pentagonal facets. The quasicrystalline phase has been examined by X-ray diffraction, high-resolution transmission electron microscopy, elemental analysis and transport measurements. In addition, results are presented for a closely related ternary crystalline phase.

Philos. Mag. B 77, 1601 (1998).