Electron-poor SrAu{sub x}In{sub 4-x} (0.5{<=}x{<=}1.2) and SrAu{sub x}Sn{sub 4-x} (1.3{<=}x{<=}2.2) phases with the BaAl{sub 4}-type structure
- Department of Chemistry, University of Alberta, Edmonton, Alta., T6G 2G2 (Canada)
Solid solutions SrAu{sub x}In{sub 4-x} (0.5{<=}x{<=}1.2) and SrAu{sub x}Sn{sub 4-x} (1.3{<=}x{<=}2.2) have been prepared at 700 deg. C and their structures characterized by powder and single-crystal X-ray diffraction. They adopt the tetragonal BaAl{sub 4}-type structure (space group I4/mmm, Z=2; SrAu{sub 1.1(1)}In{sub 2.9(1)}, a=4.5841(2) A, c=12.3725(5) A; SrAu{sub 1.4(1)}Sn{sub 2.6(1)}, a=4.6447(7) A, c=11.403(2) A), with Au atoms preferentially substituting into the apical over basal sites within the anionic network. The phase width inherent in these solid solutions implies that the BaAl{sub 4}-type structure can be stabilized over a range of valence electron counts (vec), 13.0-11.6 for SrAu{sub x}In{sub 4-x} and 14.1-11.4 for SrAu{sub x}Sn{sub 4-x}. They represent new examples of electron-poor BaAl{sub 4}-type compounds, which generally have a vec of 14. Band structure calculations confirm that substitution of Au, with its smaller size and fewer number of valence electrons, for In or Sn atoms enables the BaAl{sub 4}-type structure to be stabilized in the parent binaries SrIn{sub 4} and SrSn{sub 4}, which adopt different structure types. - Graphical abstract: BaAl{sub 4}-type structure of solid solutions SrAu{sub x}In{sub 4-x} (0.5{<=}x{<=}1.2) and SrAu{sub x}Sn{sub 4-x} (1.3{<=}x{<=}2.2), with apical sites preferentially occupied by Au atoms.
- OSTI ID:
- 21043807
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 8; Other Information: DOI: 10.1016/j.jssc.2007.06.004; PII: S0022-4596(07)00227-7; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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