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- W2068166501 abstract "Das Strontium-Rutheniumborid Sr2Ru7B8 wurde aus den Elementen bei 1100°C dargestellt (Ta-Tiegel, verschweißte Stahlampulle, Überschuß an Sr). Es kristallisiert tetragonal in der Raumgruppe P42/m mit a = 644,4(1) pm, c = 1 015,6(1) pm und Z = 2. Die Struktur wurde mit Röntgen-Einkristallmethoden bestimmt (Vierkreisdiffraktometer-Intensitäten, MoKα, R = 0,034, Rw = 0,028. 1059 symmetrieunabhängige Reflexe mit I > 2σI, 37 variable Parameter). Sr2Ru7B8 bildet eine neue, durch Substitutions- und Verschiebungsoperationen aus dem AlB2-Typ ableitbare Kanalstruktur aus. Die Kanäle, in denen sich Zick-Zack-Ketten aus Strontiumatomen befinden, verlaufen schichtweise abwechselnd in [100]- und in [010]-Richtung. Die Boratome bilden Paare und ebene, verzweigte B6-Gruppen. Der spezifische elektrische Widerstand liegt zwischen ϱ = 2,4 mΩ · cm (290 K) und ϱ = 0,8 mΩ · cm (4,2 K) (gepreßte und gesinterte Stäbchen, 4-Punkt-Gleichstrommethode). Sr2Ru7B8, a Strontium Ruthenium Boride with a New Channel Structure Derived from the AlB2-Type The strontium ruthenium boride Sr2Ru7B8 was prepared by reaction of the elements at 1 100°C (tantalum crucible sealed in a steel tube, excess of Sr). It crystallizes tetragonally in the space group P42/m with the lattice constants a = 644.4(1) pm, c = 1015.6(1) pm and Z = 2. The structure was determined by means of X-ray single crystal methods (four-circle diffractometer, MoKα, R = 0.034, Rw = 0.028, 1059 symmetrically independent reflections with I > 2σI, 37 variable parameters). Sr2Ru7B8 forms a new channel structure derivable from the AlB2 type by substitutions and shifting operations. The channels contain zig-zag chains of strontium atoms. They are running in the [100] and in the [010] directions in alternating layers. The boron atoms are arranged in pairs and in plane, branched B6 groups. The electrical resistivity is in the range from ϱ = 2.4 mΩ · cm (290 K) to ϱ = 0.8 mΩ · cm (4.2 K) (pressed and sintered rods, 4-probe DC method)." @default.
- W2068166501 created "2016-06-24" @default.
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- W2068166501 date "1991-03-01" @default.
- W2068166501 modified "2023-09-26" @default.
- W2068166501 title "Sr2Ru7B8, ein Strontium-Rutheniumborid mit einer neuen, vom AlB2-Typ abgeleiteten Kanalstruktur" @default.
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- W2068166501 doi "https://doi.org/10.1002/zaac.19915940107" @default.
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