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Zur Stabilisierung von Suboxidphasen durch Carbidionen: Die Kristallstruktur von Sr 21 Si 2 O 5 C 6
Author(s) -
Knoth Markus,
Rößler Ute,
Eisenmann Brigitte
Publication year - 2005
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200500023
Subject(s) - crystallography , suboxide , corundum , crystal structure , octahedron , materials science , zintl phase , carbide , chemistry , silicon , metallurgy
On the Stabilization of Suboxide Phases by Carbide Ions: The Crystal Structure of Sr 21 Si 2 O 5 C 6 Metallic brass‐coloured crystals of Sr 21 Si 2 O 5 C 6 were isolated from samples starting from the educts Sr : SiO : C = 21 : 2 : 6 heated under argon atmosphere in corundum crucibles up to 1150 K. The air‐sensitive compound crystallizes in the cubic system, space group $F d \: \overline{\mathit{3}} \: m, a$ = 1914,56(19) pm, Z = 8. In the crystal structure the Si, O and C atoms are coordinated only by Sr atoms forming distorted icosahedra around Si and distorted octahedra around O and C. The compound can be classified as an electron precise Zintl phase according to (Sr 2+ ) 21 (Si 4− ) 2 (O 2− ) 5 (C 4− ) 6 .