KAISER, V.; LE LIRZIN, Antoine; DARRIET, Jacques; TRESSAUD, Alain; HOLLER, H.; BABEL, Dietrich

doi:10.1002/1521-3749(200212)628:12<2617::AID-ZAAC2617>3.0.CO;2-4

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KAISER, V.
Institut für Kristallographie der Technischen Hochschule

LE LIRZIN, Antoine
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DARRIET, Jacques
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie. 2002, vol. 628, n° 12, p. 2617-2624

Wiley-VCH Verlag

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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.< Réduire

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Structure elucidation

Transition metals

Jahn-Teller distortion

Magnetic properties

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