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@ARTICLE{Li:57555,
author = {Li, M. R. and Deng, D. W. and Kuo, K. H.},
title = {{C}rystal structure of the hexagonal ({Z}n, {M}g)4{H}o and
({Z}n, {M}g)4{E}r},
journal = {Journal of alloys and compounds},
volume = {414},
issn = {0925-8388},
address = {Lausanne},
publisher = {Elsevier},
reportid = {PreJuSER-57555},
year = {2006},
note = {Record converted from VDB: 12.11.2012},
abstract = {The crystal structure of the hexagonal (Zn, Mg)(4)Ho/Er was
determined by single crystal X-ray diffraction analysis. For
the Zn68.4Mg12.7Ho18.9, the structural model, refined to a
final R-value of 0.0672, has the composition of
Zn69.34Mg12.01Ho18.65, a = 14.259 angstrom and c = 14.007
angstrom, and the space group P6(3)/mmc (No. 194). Among the
10 Zn, 2 Mg, and 4 Ho independent sites, 3 Zn sites are
icosahedral coordinated whereas I Mg is located at the
center of a CN15 Kasper deltahedron enclosed by 26 triangles
and 15 vertices. In the (100) directions, there are four
interpenetrated icosahedra, I4(P), within an a period,
constituting an icosahedral (001) layer block in half of the
unit-cell. In the [001] direction, in addition to the two
face-sharing icosahedra, I2(F), there is still a CN15 Kasper
deltahedron. For the Zn70.8Mg10.6Er18.6, the final
refinement led to a R-value of 0.0708. The atom coordinates
are very close to those of above (Zn, Mg)(4)Ho, the largest
difference between two corresponding coordinates being only
0.00086. Thus (Zn, Mg)(4)Er is iso-structural with (Zn,
Mg)(4)Ho. This hexagonal (Zn, Mg)(4)RE phase has also been
found in RE = Y, Sm, Gd, Dy, and Yb cases and they are
probably also iso-structural with (Zn, Mg)(4)Ho/Er. This
structure is icosahedrally closely related to the other two
known, hexagonal, Zn-rich (Zn, Mg)(n)RE structures, namely,
the Zn6Mg3Y/Sm/Gd [H. Takakura, A. Sato, A. Yamamoto, A.P.
Tsai, Phil. Mag. Lett. 78 (1998) 263; K. Sugiyarna, K.
Yasuda, T. Ohsuna, K. Hiraga, Z. Kristallogn 213 (1998) 537]
and the Zn3MgY [D.W. Deng, K.H. Kuo, Z.P. Luo, D.J. Miller,
M.J. Kramer, D.W. Dennis, J. Alloys Compd. 373 (2004) 156].
All these three hexagonal phases coexist with the
icosahedral quasicrystal in the Zn-Mg-RE alloys. (c) 2005
Elsevier B.V. All rights reserved.},
keywords = {J (WoSType)},
cin = {IFF-IMF},
ddc = {670},
cid = {I:(DE-Juel1)VDB37},
pnm = {Kondensierte Materie},
pid = {G:(DE-Juel1)FUEK414},
shelfmark = {Chemistry, Physical / Materials Science, Multidisciplinary
/ Metallurgy $\&$ Metallurgical Engineering},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000236955900012},
doi = {10.1016/j.jallcom.2005.07.008},
url = {https://juser.fz-juelich.de/record/57555},
}