issue contents
December 1995 issue
inorganic compounds
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The asymmetric unit of K3Nb3Ti2O11F4 contains two STX6 octahedra where X = O, F or OF (= 1/4 F + 3/4 O) and ST = (3/5 Nb + 2/5 Ti). The K-atom environment is similar to that in ferroelectric phases, but the weak distortion of the octahedra and the occupation of their centres by Nb5+ and Ti4+ cations result in paraelectric behaviour.
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The structure of Fe2Al3Si3 consists of a compact three-dimensional arrangement of FeM10 and FeM9 iron-centred polyhedra (M = Al or Si). Si has 9 to 11 neighbours and Al 11 or 12 neighbours at distances less than 3.1Å.
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Dicerium pentanickel dizinc, Ce2Ni5Zn2, crystallizes as a new ordered substitution variant of the Er2Co7 structure type, and cerium dinickel zinc, CeNi2Zn, crystallizes with the YRh2Si structure type.
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H9Tb7Ce6(SO4)27.72.2H2O is isomorphous with the Nd compound reported previously, but is less stable and features unexpectedly long Tb-O distances.
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The structure of Mg2B2O5 is built from tetrameric Mg4O18 chains of trans-edge-sharing Mg octahedra held together by B atoms which form B2O5 groups.
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Pr3(SiO4)2Cl is isostructural with La3(SiO4)2Cl. The structure comprises layers of Pr(2)(SiO4)4Cl2 octahedra separated in the a direction by Pr(1) cations occupying Pr(1)O7Cl polyhedral sites.
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K(VO2)3(SeO3)2 is a new layered phase based on hexagonal tungsten-oxide-like sheets of vertex-sharing VO6 octahedra. It is isostructural with NH4(VO2)3(SeO3)2.
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The structure of NaGaSi2O6 is similar to that of jadeite (NaAlSi2O6). Comparison of the structure of NaGaSi2O6 with those of eleven other NaM3+Si2O6 pyroxenes suggests that the octahedrally coordinated Ga3+ ions exist in two different electronic states.
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The structure of S4N4Cl2 has been redetermined at 120K. The results are compared with those of an earlier study using photographic data obtained at ambient temperature.
metal-organic compounds
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organic compounds
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