F-AlCoPdGe Alloy with Three Types of Pseudo-Mackay Clusters

• Authors: K. Sugiyama , K. Yubuta , Y. Yokoyama , S. Suzuki , R. Simura
• Languages of publication: EN

Abstracts

EN

The structure of an F-AlCoPdGe alloy was determined by single-crystal X-ray diffraction analysis: space group Pa3̅ (No. 205), Pearson symbol cP1128-142.4, a = 24.4338(4) Å; R1 = 0.0526 for the observed 5106 reflections with F_0 > 4.0σ(F_0). The F-AlCoPdGe alloy exhibited three types of pseudo-Mackay clusters (pMCs). The first shell of the Co(13)-pMC at 24d indicated a coordination polyhedron typically found in Al-Co binary approximants; the second shell was a combination of an M icosahedron and an Al icosidodecahedron, where M is a mixed site of Pd and/or Co. The first shell of the Co(14)-pMC at 4b consisted of 20 partially occupied Al positions arranged in a dodecahedral fashion; its second shell was also composed of an M icosahedron and an Al icosidodecahedron. The first shell of the Al(18)-pMC at 4a consisted of a combination of an M cube and an Al octahedron, resulting in the rhombic dodecahedral arrangement; its outer shell structure was similar to those of the other pMCs. The structure of the F-AlCoPdGe phase comprised an arrangement of these three types of pMCs together with interstitially placed Al icosahedra around the Pd/Al(1) and Pd/Al(2) sites.

Keywords

EN

61.66.Dk; 61.05.cp; 61.44.Br

Discipline

• 61.05.cp: X-ray diffraction
• 61.44.Br: Quasicrystals
• 61.66.Dk: Alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 2
• Pages: 588-593

Dates

published

2014-08

Contributors

author

K. Sugiyama

• Institute for Materials Research (IMR), Tohoku University, Sendai, Japan

author

K. Yubuta

• Institute for Materials Research (IMR), Tohoku University, Sendai, Japan

author

Y. Yokoyama

• Institute for Materials Research (IMR), Tohoku University, Sendai, Japan

author

S. Suzuki

• Institute for Materials Research (IMR), Tohoku University, Sendai, Japan

author

R. Simura

• Institute for Materials Research (IMR), Tohoku University, Sendai, Japan

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Identifiers

DOI

10.12693/APhysPolA.126.588