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Title: Structure-Composition Subtleties in NaZn13-type Derivatives of Sr/Ca(AuxAl1–x)12–13

Journal Article · · Zeitschrift fuer Anorganische und Allgemeine Chemie
 [1];  [1];  [2]
  1. Iowa State Univ., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States); Ames Lab., Ames, IA (United States)

In the ternary (Sr/Ca)-Au-Al phase space for 5–8 at % Sr/Ca and nearly equimolar mixture of Au and Al, five new NaZn13-derivatives Sr/Ca(AuxAl1–x)12–13 were discovered and their atomic site preferences and electronic structures were studied: (1) at higher Au content, cubic SrAuxAl13–x [7.24(2) ≥ x ≥ 6.68(2)] shows no obvious atomic site preferences; (2) at lower Au content, tetragonal SrAuxAl13–x [6.59(1) ≥ x ≥ 6.35(3)] shows icosahedra exclusively centered by Al and preferential atomic arrangements to maximize the number of Au–Al (or Al-rich) shortest distances; (3) a monoclinic SrAu6.10(3)Al6.40 compound was uncovered from studies of a single crystal specimen with problematic refinement issues but more detailed powder X-ray diffraction analysis which suggest even more pronounced geometric distortion from the NaZn13-type structure as well as preferential arrangements for Au–Al nearest contacts; (4) tetragonal SrAu5.75(2)Al6.25 with all empty icosahedra; and (5) orthorhombic CaAu6.09(2)Al6.01(1) with icosahedra that are half empty and half partially occupied by Al. Electronic DOS and COHP curves were used to rationalize the structural depiction of Sr/Ca(AuxAl1–x)12–13 as icosahedra packing of (AuxAl1–x)12–13 with voids filled by the electropositive Sr/Ca.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-07CH11358; NSF-DMR-10-05765
OSTI ID:
1734521
Report Number(s):
IS-J-10,369
Journal Information:
Zeitschrift fuer Anorganische und Allgemeine Chemie, Vol. 647, Issue 2-3; ISSN 0044-2313
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (28)

Generalized Gradient Approximation Made Simple journal October 1996
The structural significance of the number of skeletal bonding electron-pairs in carboranes, the higher boranes and borane anions, and various transition-metal carbonyl cluster compounds journal January 1971
Minimal basis sets in the linear muffin-tin orbital method: Application to the diamond-structure crystals C, Si, and Ge journal August 1986
Zur kenntnis der ternären aluminide Ba5Cu1,9Al3,1, BaAg2,4Al2,6, Ba16Ag7Al27 und Ba3Ag14,6Al6,4 journal June 1991
Cation-Poor Complex Metallic Alloys in Ba(Eu)–Au–Al(Ga) Systems: Identifying the Keys that Control Structural Arrangements and Atom Distributions at the Atomic Level journal October 2015
A technique for relativistic spin-polarised calculations journal August 1977
An empirical correction for absorption anisotropy journal January 1995
Compositional evolution of the NaZn 13 structure motif in the systems La–Ni–Ga and Ce–Ni–Ga journal January 2018
Projector augmented-wave method journal December 1994
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Topological charge stabilization journal April 1983
Turning Gold into “Diamond”: A Family of Hexagonal Diamond-Type Au-Frameworks Interconnected by Triangular Clusters in the Sr–Al–Au System journal February 2014
Heteroleptic Dipyrrin/Bipyridine Complexes of Ruthenium(II) journal January 2009
Linking Intermetallics and Zintl Compounds:  An Investigation of Ternary Trielides (Al, Ga, In) Forming the NaZn 13 Structure Type journal February 1999
Zintl Phases: Transitions between Metallic and Ionic Bonding journal September 1973
Absolute electronegativity and hardness: application to inorganic chemistry journal February 1988
Crystal orbital Hamilton populations (COHP): energy-resolved visualization of chemical bonding in solids based on density-functional calculations journal August 1993
The Physics of the Hume-Rothery Electron Concentration Rule journal January 2017
Kristallstruktur von AuAl journal November 1970
Quantitative Advances in the Zintl–Klemm Formalism book October 2010
The crystal structures of SrZn5 and BaZn5 journal April 1956
Ab initiomolecular dynamics for liquid metals journal January 1993
An Application of the “Coloring Problem”:  Structure−Composition−Bonding Relationships in the Magnetocaloric Materials LaFe 13 - x Si x journal January 2008
A local exchange-correlation potential for the spin polarized case. i journal July 1972
A profile refinement method for nuclear and magnetic structures journal June 1969
POWDER CELL – a program for the representation and manipulation of crystal structures and calculation of the resulting X-ray powder patterns journal June 1996
Binary icosahedral clusters: Atom and electron counting rules journal August 1993
Synthesis, Structure, and Physical Properties of Ln (Cu,Al,Ga) 13– x ( Ln = La–Pr, and Eu) and Eu(Cu,Al) 13– x journal September 2012