Arrangements of Transition-Metal Atoms in Three Types of Al-Co-Ni Decagonal Quasicrystals Studied by Cs-Corrected HAADF-STEM

作者：Hiraga K^*; Yasuhara A

来源：Materials Transactions, 2013, 54(4): 493-497.

DOI：10.2320/matertrans.M2012340

• quasicrystal
• decagonal quasicrystal
• structure
• aluminum-cobalt-nickel
• aberration-corrected scanning transmission electron microscopy
• high-angle annular detector dark-field scanning transmission electron microscopy
• stem
• haadf-stem

Three types of Al-Co-Ni decagonal quasicrystals in Al72.5Co11Ni16.5, Al71Co14.5Ni14.5 and Al71.5Co16Ni12.5 alloys have been examined by Cs-corrected high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM), which has an enough resolution to represent individual TM atoms as bright dots in observed images of decagonal quasicrystals. On the basis of the structure of a W-(AlNiCo) crystalline approximant, transition-metal (TM) atoms and mixed sites (MSs) of Al and TM atoms are separately distinguished in HAADF-STEM images. Most of TM atoms are arranged with pentagonal tilings of a bond-length of 0.76 nm, and MSs are located inside of pentagonal frames with definite orientations. All of the TM atoms and MSs are located at lattice points of a Penrose lattice of an edge-length of 0.25 nm, and arranged with a bond-orientational order. The present result shows that the structures of Al-Co-Ni decagonal quasicrystals should be characterized as BOO arrangements of transition-metal atoms, instead of previous models of BOO arrangements of 2 nm atom clusters.

• 出版日期2013