TY - JOUR
T1 - Structure of a W-(AlCoNi) crystalline phase related to Al-Co-Ni decagonal quasicrystals, studied by single crystal X-ray diffraction
AU - Sugiyama, K.
AU - Nishimura, S.
AU - Hiraga, K.
N1 - Funding Information:
This work has been financially supported by a Grant-in-Aid for Scientific Research (B) (No. 12450257) from the Japanese Society for the Promotion of Science.
PY - 2002/8/14
Y1 - 2002/8/14
N2 - The crystal structure of a W-(AlCoNi) phase, which is closely related to Al-Co-Ni decagonal quasicrystals, has been studied by the single crystal X-ray diffraction. The W-(AlCoNi) phase was obtained from an Al72.5Co20Ni7.5 alloy sample annealed at 950 °C and its structure indicates the space group Cm (No. 8) with lattice parameters a=39.668(3) Å, b=8.158(1) Å, c=23.392(1) Å and β=90.05(1)°. A structural model with R(F) less than 0.087 for the observed 16 200 reflections can reproduce contrasts of atomic scale images obtained by high-angle annular detector dark-field scanning transmission electron microscopy together with high-resolution electron microscopy. The structure of the W-(AlCoNi) phase provides a fundamental atomic arrangement for the columnar atom cluster observed commonly in the Al-Co-Ni decagonal quasicrystals, and makes it possible to derive a structural model for the structures of the Al-Co-Ni decagonal quasicrystals.
AB - The crystal structure of a W-(AlCoNi) phase, which is closely related to Al-Co-Ni decagonal quasicrystals, has been studied by the single crystal X-ray diffraction. The W-(AlCoNi) phase was obtained from an Al72.5Co20Ni7.5 alloy sample annealed at 950 °C and its structure indicates the space group Cm (No. 8) with lattice parameters a=39.668(3) Å, b=8.158(1) Å, c=23.392(1) Å and β=90.05(1)°. A structural model with R(F) less than 0.087 for the observed 16 200 reflections can reproduce contrasts of atomic scale images obtained by high-angle annular detector dark-field scanning transmission electron microscopy together with high-resolution electron microscopy. The structure of the W-(AlCoNi) phase provides a fundamental atomic arrangement for the columnar atom cluster observed commonly in the Al-Co-Ni decagonal quasicrystals, and makes it possible to derive a structural model for the structures of the Al-Co-Ni decagonal quasicrystals.
KW - Al-Co-Ni
KW - Crystalline approximant
KW - Single-crystal X-ray diffraction
KW - Structure
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U2 - 10.1016/S0925-8388(02)00135-4
DO - 10.1016/S0925-8388(02)00135-4
M3 - Article
AN - SCOPUS:0037077640
SN - 0925-8388
VL - 342
SP - 65
EP - 71
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -