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Atomic Structure of the Unique Antiferromagnetic 2/1 Quasicrystal Approximant by Labib, Farid; Takakura, Hiroyuki; Ishikawa, Asuka; Tamura, Ryuji is a scholarly article available to read on EtoBox.

What is Atomic Structure of the Unique Antiferromagnetic 2/1 Quasicrystal Approximant about?

The atomic structure of the recently discovered antiferromagnetic Ga50Pd35.5Tb14.5 2/1 approximant to quasicrystal with the space group of Pa-3(No. 205), a = 23.1449(0) angstrom was determined by means of a single crystal X-ray diffraction. The refined structure model revealed two main building units, namely, a Tsai-type rhombic triacontahedron (RTH) cluster with three concentric inner shells and an acute rhombohedron filling the gaps in between the RTH clusters. One of the interesting findings was a very low number of chemically mixed sites in the structure, which amount to only 7.40 % of the all the atomic sites within an RTH cluster. In particular, a disorder-free environment was noticed within a nearest neighbor of an isolated Tb3+ ion, which is presumably one of the main contributors in enhancing antiferromagnetic order in the present compound. The second significant finding was the observance of an orientationally ordered trigonal pyramid-like unit with a height of 4.2441(7) angstrom at the center of the RTH cluster, which has never been observed in Tsai-type compounds before. Such unit is noticed to bring structural distortion to outer shells, in particular, to the surroundi

Author

Labib, Farid; Takakura, Hiroyuki; Ishikawa, Asuka; Tamura, Ryuji

Published

2023

Language

EN