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- W2022792821 abstract "Durch Erhitzen von Elementgemengen mit einer der jeweiligen Formel entsprechenden Zusammensetzung wurden acht neue ternare Aluminiumsilicide dargestellt und ihre Kristallstrukturen mit Einkristallen rontgenographisch bestimmt. Tb2Al3Si2 (a = 10,197(2), b = 4,045(1), c = 6,614(2) A, β = 101,11(2)°) und Dy2Al3Si2 (a = 10,144(6), b = 4,028(3), c = 6,580(6) A, β = 101,04(6)°) kristallisieren im Y2Al3Si2-Typ (C2/m; Z = 2), der von gewellten Al,Si-Schichten gepragt wird, die uber weitere Al-Atome mittels linearer Si–Al–Si-Bindungen miteinander verknupft sind. Dadurch entstehen entlang [010] Kanale, in denen sich die Seltenerdmetall-Atome befinden. Die Silicide Ln2AlSi2 mit Ln = Y (a = 8,663(2), b = 5,748(1), c = 4,050(1) A), Ho (a = 8,578(2), b = 5,732(1), c = 4,022(1) A), Er (a = 8,529(2), b = 5,719(2), c = 4,011(1) A), Tm (a = 8,454(5), b = 5,737(2), c = 3,984(2) A) und Lu (a = 8,416(2), b = 5,662(2), c = 4,001(1) A) haben eine zum W2CoB2-Typ (Immm; Z = 2) analoge Atomanordnung, wahrend Yb2AlSi2 (a = 6,765(2), c = 4,226(1) A; P4/mbm; Z = 2) eine geordnete U3Si2-Besetzungsvariante bildet. In allen Verbindungen wird Silicium von trigonalen Metallatomprismen umgeben, durch deren Flachenverknupfung Si2-Hanteln zustande kommen, in denen die Si–Si-Abstande (2,37–2,42 A) einer Einfachbindung entsprechen.Synthesis and Crystal Structures of Ln2Al3Si2 and Ln2AlSi2 (Ln: Y, Tb–Lu)Eight new ternary aluminium silicides were prepared by heating mixtures of the elements and investigated by means of single-crystal X-ray methods. Tb2Al3Si2 (a = 10.197(2), b = 4.045(1), c = 6.614(2) A, β = 101.11(2)°) and Dy2Al3Si2 (a = 10.144(6), b = 4.028(3), c = 6.580(6) A, β = 101.04(6)°) crystallize in the Y2Al3Si2 type structure, which contains wavy layers of Al and Si atoms linked together by additional Al atoms and linear Si–Al–Si bonds. Through this there are channels along [010], which are filled by Tb and Dy atoms respectively. The silicides Ln2AlSi2 with Ln = Y (a = 8.663(2), b = 5.748(1), c = 4.050(1) A), Ho (a = 8.578(2), b = 5.732(1), c = 4.022(1) A), Er (a = 8.529(2), b = 5.719(2), c = 4.011(1) A), Tm (a = 8.454(5), b = 5.737(2), c = 3.984(2) A) and Lu (a = 8.416(2), b = 5.662(2), c = 4.001(1) A) crystallize in the W2CoB2 type structure (Immm; Z = 2), whereas the structure of Yb2AlSi2 (a = 6.765(2), c = 4.226(1) A; P4/mbm; Z = 2) corresponds to a ternary variant of the U3Si2 type structure. In all compounds the Si atoms are coordinated by trigonal prisms of metal atoms, which are connected by common faces so that Si2 pairs (dSi–Si: 2.37–2.42 A) are formed." @default.
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- W2022792821 title "Darstellung und Kristallstrukturen von Ln2Al3Si2 und Ln2AlSi2 (Ln: Y, Tb–Lu)" @default.
- W2022792821 doi "https://doi.org/10.1002/(sici)1521-3749(200006)626:6<1448::aid-zaac1448>3.3.co;2-h" @default.
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