Atomic-Scale Tuning of Tsai-Type Clusters in RE-Au-Si Systems (RE = Gd, Tb, Ho)

Inorganic Chemistry
Girma GebresenbutCesar Pay Gómez

Abstract

Tsai-type quasicrystals and approximants are distinguished by a cluster unit made up of four concentric polyhedral shells that surround a tetrahedron at the center. Here we show that for Tsai-type 1/1 approximants in the RE-Au-Si systems (RE = Gd, Tb, Ho) the central tetrahedron of the Tsai clusters can be systematically replaced by a single RE atom. The modified cluster is herein termed a "pseudo-Tsai cluster" and represents, in contrast to the conventional Tsai cluster, a structural motif without internal symmetry breaking. For each system, single-phase samples of both pseudo-Tsai and Tsai-type 1/1 approximants were independently prepared as millimeter-sized, faceted, single crystals using the self-flux synthesis method. The full replacement of tetrahedral moieties by RE atoms in the pseudo-Tsai 1/1 approximants was ascertained by a combination of single-crystal and powder diffraction studies, as well as energy dispersive X-ray spectroscopy (EDX) analyses with a scanning electron microscope (SEM). Differential scanning calorimetry (DSC) studies revealed distinctly higher decomposition temperatures, by 5-35 K, for the pseudo-Tsai phases. Furthermore, the magnetic properties of pseudo-Tsai phases are profoundly and consistently...Continue Reading

References

Dec 16, 2000·Nature·A P TsaiT J Sato
Apr 12, 2006·Physical Review Letters·Tetsu WatanukiAn Pang Tsai
Dec 13, 2006·Nature Materials·Hiroyuki TakakuraAn Pang Tsai
Feb 16, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·H EuchnerM de Boissieu
Mar 9, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Girma Hailu GebresenbutCesar Pay Gómez
Jun 12, 2013·Nature Materials·Alan I GoldmanPaul C Canfield
Oct 1, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·T HirotoR Tamura
May 9, 2014·Journal of Physics. Condensed Matter : an Institute of Physics Journal·T HirotoR Tamura
Jul 2, 2014·Science and Technology of Advanced Materials·Alan I Goldman
Jun 5, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Takanobu HirotoR Tamura

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Methods Mentioned

BETA
X-ray
neutron diffraction
differential
scanning electron microscopy
neutron-scattering

Software Mentioned

TAS
HighScore Plus
VESTA
GAS
Superflip
APEX
JANA2006
Diamond
PANalytical
HAS

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