issue contents
November 2002 issue
inorganic compounds
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NaZnFe2(PO4)3 features a new structural type built up from ZnO6 octahedra, FeO6 octahedra and FeO4 tetrahedra, linked together via the corners and edges of PO4 tetrahedra to form a three-dimensional framework, with tunnels running along [100]. Within these tunnels, Na+ cations occupy highly distorted cubic sites.
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In the crystal structure of the title compound, the complex anion has approximate D4d symmetry, with Dy—O and W—O distances in the ranges 2.355 (6)–2.405 (6) and 1.715 (7)–2.369 (5) Å, respectively.
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Zn is unevenly distributed over two non-equivalent tetrahedral sites within the spinel blocks of the title W-type hexaferrite structure.
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The intermetallic compound Mg21Zn25 crystallizes with the Zr21Re25 structure type.
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K3Fe5(PO4)6 exhibits a three-dimensional framework built up of FeO6, FeO5 and PO4 polyhedra, with intersecting channels in which the K+ cations are located.
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The crystal structure of lithium disodium aluminium hexafluoride, LiNa2AlF6, has been solved using X-ray powder diffraction. The monoclinically distorted structure is related to that of cubic elpasolite.
metal-organic compounds
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organic compounds
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Rietveld refinement of the neutron powder profiles of chlorofluoromethane, CH2ClF, shows that it crystallizes in the monoclinic system, with two formula units in the unit cell. The structure is close-packed and shows weakly hydrogen-bonded zigzag chains.
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