The Crystal Structure of the Potential Ferroelectric Calcium Rhenate(VI, VII) Ca11Re4O24 and its Relation to the Structure of Sr11Os4O24
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Wolfgang Jeitschko
The title compound was prepared in well-crystallized form by thermal decomposition of Ca5Re2O12. Its structure was determined from single-crystal X-ray diffractometer data: I41, a = 1107.0(1), c = 1609.3(1) pm, Z = 4, R = 0.056 for 4565 structure factors and 119 variable parameters. The calcium atoms occupy seven different sites with 8, 9, or 10 oxygen neighbors. The two different rhenium atoms are octahedrally coordinated by oxygen atoms with average Re-O distances of 193.1 and 187.7 pm for the six- and seven-valent rhenium atoms, respectively. The compound shows Curie-Weiss behavior with a magnetic moment of μexp = 1.15(±0.10) μB per Re(VI) atom. The structure is closely related to that of Sr11Os4O24 which, however, crystallizes in the space group I2/a. The difference between the two structures arises through the higher coordination numbers of the strontium atoms. It is suggested that at high temperature both compounds crystallize in the common higher symmetry space group I4/a. Since Ca11Re4O24 crystallizes in the pyroelectric class 4 this compound is expected to be ferroelectric.
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Articles in the same Issue
- Titelei
- Contents
- Über CuDy2[B8O16] und CuHo2[B8O16]: Zwei neue „Metaborate“ mit einem ∞1[B8O16]8--Anion / On CuDy2[B8O16] and CuHo2[B8O16] Two New „Metaborates“ with a ∞1[B8O16]8-Anion
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- Schwingungsspektren und Normalkoordinatenanalyse von Hexathiocyanatoplatinat(IV), Kristallstruktur von [Py2CH2][Pt(SCN)6] / Vibrational Spectra and Normal Coordinate Analysis of Hexathiocyanatoplatinate(IV), Crystal Structure of [Py2CH2][Pt(SCN)6]
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- The Crystal Structure of the Potential Ferroelectric Calcium Rhenate(VI, VII) Ca11Re4O24 and its Relation to the Structure of Sr11Os4O24
- Reaktivität nitrophenylsubstituierter cyclischer Amine bei Dehydrierungen / The Reactivity of Nitrophenyl Substituted Cyclic Amines with Dehydrogenations
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- Magnetische Eigenschaften von [Cu{OCH2CH2N(C4H9)2}NCO]4 im Bereich von 10 bis 240 K / Magnetic Properties of [Cu{OCH2CH2N(C4H9)2}NCO]4 in the Temperature Range from 10 to 240 K
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- RbAsF6, CsAsF6 und RbSbF6: Kristallstrukturen, Thermische Phasenumwandlungen und Schwingungsspektren / RbAsF6, CsAsF6 and RbSbF6: Crystal Structures, Thermal Phase Transitions, and Vibrational Spectra
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- ERRATUM