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Structure and stability of γ 1 ‐AuZn 2.1 : a γ‐brass‐related complex phase in the Au–Zn System
Author(s) -
Koley Biplab,
Thimmaiah Srinivasa,
Lidin Sven,
Jana Partha P.
Publication year - 2020
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s205252062001327x
Subject(s) - crystallography , trigonal crystal system , valence electron , superstructure , valence (chemistry) , crystal structure , atom (system on chip) , chemistry , materials science , electron , physics , computer science , organic chemistry , quantum mechanics , embedded system , thermodynamics
γ 1 ‐AuZn 2.1 in the Au–Zn binary system has been synthesized and its structure analyzed by single‐crystal X‐ray diffraction. It crystallizes in the trigonal space group P 31 m (No. 157) with ∼227 atoms per unit cell and represents a 3 a × 3 a × c superstructure of rhombohedrally distorted γ‐Au 5– x Zn 8+ y . The structure is largely tetrahedrally closed packed. The formation of γ 1 ‐AuZn 2.1 can be understood within the framework of a Hume‐Rothery stabilization mechanism with a valence electron concentration of 1.68 e/a (valence electrons per atom).