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- W2010218079 abstract "An Einkristallen von sechs Verbindungen Ba2CaMIIM2IIIF14 vom Usovit-Typ (Raumgruppe C2/c, Z = 4) wurden röntgenographische Strukturverfeinerungen durchgeführt. Die Zellparameter der untersuchten Phasen mit MIIM2III = MnV2, FeV2, CuMn2, MnFe2, CuFe2 und CuGa2 liegen im Bereich 1374≤a/pm≤1384, 534≤b/pm≤542, 1474≤c/pm≤1510, 91, 3≤ß/°≤93, 2. Die Atome Ca und MII sind nicht vollständig geordnet auf die 8- bzw. 6-fach koordinierten Positionen 4e und 4b verteilt. Im Falle von Ba2CaFeV2F14 und Ba2CaCuGa2F14 ist der gegenseitige Substitutionsgrad gleich (x≈0, 1): (Ca1-xMxII) (4e) und (M1-xIICax) (4b). Im Falle der anderen Usovite zeigten sich Ca-reichere Phasen Ba2Ca(M1-yIICay)M2IIIF14 (bis y≈0, 35) mit partieller Substitution allein auf der Oktaederposition (4b), deren Abstände MII-F entsprechend aufgeweitet sind. Die Verzerrung der [MIIF6]- und [MIIIF6]-Oktaeder in der Struktur wird durch Einbau von CuII und MnIII stark vergrößert. Die Ergebnisse magnetischer Suszeptibilitätsmessungen an Pulvern von Ba2CaMnV2F14 und Ba2CaFeV2F14 (TN≈7K) werden mitgeteilt. Structural Studies with Usovites: Ba2CaMIIV2F14 (MIII = Mn, Fe), Ba2CaMnFe2F14 and Ba2CaCuM2IIIF14 (MIII = Mn, Fe, Ga). Single crystals of six compounds Ba2CaMIIM2IIIF14 were prepared to refine their usovite type structure (space group C2/c, Z = 4) using X-ray diffractometer data. The cell parameters of the phases studied with MIIM2III= MnV2, FeV2, CuMn2, MnFe2, CuFe2 und CuGa2 are within the range 1374≤a/pm≤1384, 534≤b/pm≤542, 1474≤c/pm≤1510, 91, 3≤ß/°≤93, 2. The atoms Ca and MII are incompletely ordered on the 8- and 6-coordinated positions, 4e and 4b, respectively. In the case of Ba2CaFeV2F14 and Ba2CaCuGa2F14 there is reciprocal substitution (x≈0, 1): (Ca1-xMxII) (4e) and (M1-xIICax) (4b). In the case of the other usovites Ca-enriched phases Ba2Ca(M1-yIICay)M2IIIF14 occured (up to y≈0, 35), exhibiting partial substitution at the octahedral position (4b) only, showing a corresponding increase in MII-F distances. The distortion of [MIIF6] and [MIIIF6] octahedra within the structure is considerably enhanced on replacement by CuII and MnIII. The results of powder magnetic susceptibility measurements of Ba2CaMnV2F14 and Ba2CaFeV2F14 (TN≈7K) are reported." @default.
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- W2010218079 date "2002-12-01" @default.
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- W2010218079 title "Strukturuntersuchungen an Usoviten: Ba2CaMIIV2F14 (MIII = Mn, Fe), Ba2CaMnFe2F14 und Ba2CaCuM2IIIF14 (MIII = Mn, Fe, Ga)" @default.
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