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- W2074033510 abstract "Die bisher als α-Modifikation von Sr2MnO4 beschriebene Substanz stellt ein Gemenge aus SrO und Sr7Mn4O15 dar. Bis zu 0,3 mm lange schwarze Einkristalle wurden durch Erhitzen von vorreagiertem Sr7Mn4O15, SrO und SrCl2 in einer unter Argon zugeschmolzenen Platinampulle auf 1350°C erhalten. Die neue Verbindung kristallisiert monoklin in der Raumgruppe P 21/c mit den Gitterkonstanten a = 681,78(6), b = 962,24(8), c = 1038,0(1)pm, β = 91,886(7)° und Z = 2 in einem neuen Strukturtyp, der mit α-SrMnO3 verwandt ist. Charakteristisch für die Struktur von Sr7Mn4O15 sind Schichten eckenverknüpfter Doppeloktaeder[O2/2OMnO3MnO2O1/2]7− parallel zur (100). Oberhalb 100K folgt der Magnetismus von Sr7Mn4O15 dem Curie-Weiss-Gesetz mit Θ ∼ -426K und einem Moment μeff = 3,62μB pro Mn entsprechend Mn4+. On the Compound Sr7Mn4O15 and Structure Relations to Sr2MnO4 and α-SrMnO3 The “compound” hitherto described as a α modification of Sr2MnO4 is shown to consist of a mixture of SrO and the new monoclinic compound Sr7Mn4O15 crystallizing in the space group P 21/c, a = 681.78(6), b = 962.24(8), c = 1038.0(1) pm, β = 91.886(7)°, Z = 2. Up to 0.3 mm long black crystals were grown from prereacted Sr7Mn4O15, SrO, and SrCl2 at 1350°C in a sealed platinum tube under argon. Its structure is related to α-SrMnO3. It contains layers of cornershared double octahedra [O2/2OMnO3MnO2O1/2]7− parallel to (100). Above 100 K the magnetism of Sr7Mn4O15 follows the Curie Weiss law with Θ ∼ -426 K and a moment μeff = 3.62 μB corresponding Mn4+." @default.
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- W2074033510 date "1992-11-01" @default.
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- W2074033510 title "�ber die Verbindung Sr7Mn4O15 und Beziehungen zur Struktur von Sr2MnO4 und ?-SrMnO3" @default.
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- W2074033510 doi "https://doi.org/10.1002/zaac.19926170117" @default.
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