TY - JOUR
T1 - Ho arrangement in the Zn6Mg3Ho icosahedral quasicrystal studied by atomic-resolution Z-contrast STEM
AU - Abe, E.
AU - Takakura, H.
AU - Tsai, A. P.
N1 - Funding Information:
We thank Dr T. J. Sato for providing the sample and valuable discussion. This work is partly supported by Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation.
PY - 2001
Y1 - 2001
N2 - The atomic structure of the Zn6Mg3Ho icosahedral quasicrystal has been studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) with Z-contrast (Z: atomic number). We demonstrate that in particular Z-contrast imaging is quite powerful for specifying heavy atom positions in the quasicrystalline compound, as shown by a comparison with high-resolution phase-contrast imaging. It is confirmed that the observed Z-contrast images are fairly well explained by the projected potential of only the Ho atomic arrangement, which was recently proposed by X-ray diffraction analysis; Ho occupies an even-body-center site of the 3-dimensional Penrose lattice. Consequently, the present direct structural observation strongly supports the validity of the proposed Ho site.
AB - The atomic structure of the Zn6Mg3Ho icosahedral quasicrystal has been studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) with Z-contrast (Z: atomic number). We demonstrate that in particular Z-contrast imaging is quite powerful for specifying heavy atom positions in the quasicrystalline compound, as shown by a comparison with high-resolution phase-contrast imaging. It is confirmed that the observed Z-contrast images are fairly well explained by the projected potential of only the Ho atomic arrangement, which was recently proposed by X-ray diffraction analysis; Ho occupies an even-body-center site of the 3-dimensional Penrose lattice. Consequently, the present direct structural observation strongly supports the validity of the proposed Ho site.
KW - Atomic-resolution Z-contrast scanning transmission electron microscopy
KW - Icosahedral quasicrystals
KW - Intermetallic compound
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U2 - 10.1093/jmicro/50.3.187
DO - 10.1093/jmicro/50.3.187
M3 - Article
C2 - 11469407
AN - SCOPUS:0034936293
SN - 2050-5698
VL - 50
SP - 187
EP - 195
JO - Microscopy (Oxford, England)
JF - Microscopy (Oxford, England)
IS - 3
ER -