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Chemical speciation in Gd−Cd−M (M=Zn, Au) quasicrystal approximants
Author(s) -
Gebresenbut Girma H.,
Pay Gómez Cesar,
Eriksson Lars,
Häussermann Ulrich
Publication year - 2021
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202000414
Subject(s) - quasicrystal , crystallography , crystal structure , chemistry , homogeneous , single crystal , zinc , physics , thermodynamics , organic chemistry
We investigated the effect of partial replacement of Cd by M=Au and Zn in the crystal structure of the 1/1 Tsai‐type quasicrystal approximant (AC) GdCd 6 . Compositionally homogeneous single crystal samples Gd(Cd 0.87 Zn 0.13(1) ) 6 and Gd(Cd 0.80 Au 0.20(1) ) 6 were grown from melts Gd 5 (Cd 0.8 Zn 0.2 ) 100 and Gd 1 (Cd 0.9 Au 0.1 ) 100 , respectively, and isolated by centrifugation. The M for Cd substitution in GdCd 6 is accompanied with a sizeable reduction of the cubic unit cell parameter, from 15.514(2) Å to 15.329(1) Å (Zn) and 15.314(1) Å (Au). Site preferences were established from single crystal X‐ray diffraction data. A clear preference of atomic sites for Au and Zn is noted which is compared to earlier reported Yb(Cd 0.75 Mg 0.25 ) 6 . Three and two out of in total seven crystallographic sites defining the Cd partial structure accept preferably metals more and less electronegative than Cd, respectively, and are classified as negatively and positively polarized sites in the binary 1/1 AC.