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• W2039578034 abstract "A populous group of ternary trielide rich (Al, Ga, In) intermetallics forming the NaZn(13) structure type has been synthesized from stoichiometric combinations of the elements in an arc melter. These ternary compounds have the general formula AM(x)()T(13)(-)(x)(), where A = Ba, Sr, La, Eu, M = Cu and Ag, and T = Al, Ga, and In, with 5 </= x </= 6.5, and have been structurally characterized by both powder and single-crystal X-ray diffraction. Furthermore, magnetic susceptibility, electrical resistivity, XPS, and EDS measurements are reported for some of the samples. Single-crystal X-ray diffraction experiments on BaCu(5)Al(8) (BaCu(5.10(7))Al(7.90(7)), cubic, a = 12.205(4) Å, Z = 8) and EuCu(6.5)Al(6.5) (EuCu(6.41(5))Al(6.59(5)), cubic, a = 11.928(1) Å, Z = 8) indicate that the quasi-infinite three-dimensional [Cu(x)()Al(13)(-)(x)()] framework involves mostly Cu atoms centering icosahedra, with its vertexes randomly occupied by the remaining Cu and Al atoms. On the other hand, when M = Ag, Al shows a greater tendency to occupy the center of the icosahedra. A systematic study of the compositional variation in BaCu(x)()Al(13)(-)(x)() demonstrates that the NaZn(13) type phase exists within a narrow range of x between five and six. To examine the role of the cation A in stabilizing this structure, quaternary phases, e.g., BaSrAg(12)Al(14) (BaSrAg(12.0(1))Al(14.0(1)), cubic, a = 12.689(1) Å, Z = 4) and SrCeCu(12)Al(14) (SrCeCu(11.74(2))Al(14.26(2)), cubic, a = 11.938(1) Å, Z = 4), were prepared and characterized. Extended Hückel calculations on these ternary aluminides demonstrate how the tuning of the system's stoichiometry maximizes the bonding within the atom-centered icosahedral framework. These calculations also address the substitution pattern of M and T within the [M(x)()T(13)(-)(x)()] network. Tight-binding LMTO calculations have also been applied to examine the charge-density and electron-localization functions (ELF) in this structure for different electron counts in order to address the nature of chemical bonding in these phases. One important conclusion from the theoretical results is that the NaZn(13) type phases show optimal stability for 40-42 valence electrons for the [M(x)()T(13)(-)(x)()] framework." @default.
• W2039578034 created "2016-06-24" @default.
• W2039578034 creator A5009845829 @default.
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• W2039578034 date "1999-01-22" @default.
• W2039578034 modified "2023-10-18" @default.
• W2039578034 title "Linking Intermetallics and Zintl Compounds: An Investigation of Ternary Trielides (Al, Ga, In) Forming the NaZn₁₃ Structure Type" @default.
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• W2039578034 doi "https://doi.org/10.1021/ic980772k" @default.
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