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@ARTICLE{Singh:173006,
author = {Singh, D. and Yun, Y. and Wan, W. and Grushko, Benjamin and
Zou, X. D. and Hovmöller, S.},
title = {{A} complex pseudo-decagonal quasicrystal approximant
{A}l$_{37}$({C}o,{N}i)$_{15.5}$ solved by the rotation
electron diffraction ({RED}) method},
journal = {Journal of applied crystallography},
volume = {47},
issn = {0021-8898},
address = {Copenhagen},
publisher = {Munksgaard},
reportid = {FZJ-2014-06420},
pages = {215 - 221},
year = {2014},
abstract = {Electron diffraction is a complementary technique to
single-crystal X-ray diffraction and powder X-ray
diffraction for structure solution of unknown crystals.
Crystals too small to be studied by single-crystal X-ray
diffraction or too complex to be solved by powder X-ray
diffraction can be studied by electron diffraction. The main
drawbacks of electron diffraction have been the difficulties
in collecting complete three-dimensional electron
diffraction data by conventional electron diffraction
methods and the very time-consuming data collection. In
addition, the intensities of electron diffraction suffer
from dynamical scattering. Recently, a new electron
diffraction method, rotation electron diffraction (RED), was
developed, which can overcome the drawbacks and reduce
dynamical effects. A complete three-dimensional electron
diffraction data set can be collected from a
sub-micrometre-sized single crystal in less than 2 h. Here
the RED method is applied for ab initio structure
determination of an unknown complex intermetallic phase, the
pseudo-decagonal (PD) quasicrystal approximant
Al37.0(Co,Ni)15.5, denoted as PD2. RED shows that the
crystal is F-centered, with a = 46.4, b = 64.6, c = 8.2 Å.
However, as with other approximants in the PD series, the
reflections with odd l indices are much weaker than those
with l even, so it was decided to first solve the PD2
structure in the smaller, primitive unit cell. The basic
structure of PD2 with unit-cell parameters a = 23.2, b =
32.3, c = 4.1 Å and space group Pnmm has been solved in the
present study. The structure with c = 8.2 Å will be taken
up in the near future. The basic structure contains 55
unique atoms (17 Co/Ni and 38 Al) and is one of the most
complex structures solved by electron diffraction. PD2 is
built of characteristic 2 nm wheel clusters with fivefold
rotational symmetry, which agrees with results from
high-resolution electron microscopy images. Simulated
electron diffraction patterns for the structure model are in
good agreement with the experimental electron diffraction
patterns obtained by RED.},
cin = {PGI-5},
ddc = {540},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {424 - Exploratory materials and phenomena (POF2-424)},
pid = {G:(DE-HGF)POF2-424},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000330485100029},
doi = {10.1107/S1600576713029294},
url = {https://juser.fz-juelich.de/record/173006},
}