Atomic Scale coexistence of Periodic and quasiperiodic order in a2-fold A1-Ni-Co decagonal quasicrystal surface

Journal Article · Mon Nov 14 00:00:00 EST 2005 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.72.220201· OSTI ID:900780

Park, Jeong Young; Ogletree, D Frank; Salmeron, Miquel; Ribeiro, R A; Canfield, P C; Jenks, C J; Thiel, P A

Decagonal quasicrystals are made of pairs of atomic planes with pentagonal symmetry periodically stacked along a 10-fold axis. We have investigated the atomic structure of the 2-fold surface of a decagonal Al-Ni-Co quasicrystal using scanning tunneling microscopy (STM). The surface consists of terraces separated by steps of heights 1.9, 4.7, 7.8, and 12.6{angstrom} containing rows of atoms parallel to the 10-fold direction with an internal periodicity of 4{angstrom}. The rows are arranged aperiodically, with separations that follow a Fibonacci sequence and inflation symmetry. The results indicate that the surfaces are preferentially Al-terminated and in general agreement with bulk models.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Director. Office of Science. Office of AdvancedScientific Computing Research. Office of Basic Energy Sciences. MaterialsSciences and Engineering Division, Ames Laboratory
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 900780
• Report Number(s): LBNL-59105; R&D Project: 517950; BnR: KC0203010; TRN: US200711%%554
• Journal Information: Physical Review B, Vol. 72; Related Information: Journal Publication Date: 2005
• Country of Publication: United States
• Language: English

Related Subjects

36
ATOMS
PERIODICITY
SCANNING TUNNELING MICROSCOPY
SYMMETRY