03 Fakultät Chemie
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/4
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Item Open Access Scheelite-type sodium neodymium(III) ortho-oxidomolybdate(VI), NaNd[MoO4]2(2011) Schleid, Thomas; Hartenbach, IngoThe crystal structure of Scheelite-type NaNd[MoO4]2 is described in the paper.Item Open Access The defect scheelite-type lanthanum(III) ortho-oxidomolybdate(VI) La0.667[MoO4](2013) Schustereit, Tanja; Schleid, Thomas; Hartenbach, IngoThe crystal structure of La0.667[MoO4] in the Scheelite-type is described in that paper.Item Open Access Defect scheelite-type lanthanoid(III) ortho-oxomolybdates(VI) Ln0.667[MoO4] (Ln = Ce, Pr, Nd, and Sm) and their relationship to zircon and the NaTl-type structure(2011) Schustereit, Tanja; Müller, Sabine L.; Schleid, Thomas; Hartenbach, IngoThe rare-earth metal(III) ortho-oxomolybdates with the formula Ln0.667[MoO4] (Ln = Ce, Pr, Nd, and Sm) and defect scheelite-type structure crystallize in the tetragonal space group I41/a (a = 533–525, c = 1183–1158 pm) with four formula units per unit cell. The Ln3+ cations at Wyckoff position 4b exhibit a coordination sphere of eight oxygen atoms in the shape of a trigonal dodecahedron. The same site symmetry ( 4 ..) is observed for the tetrahedral oxomolybdate(VI) entities [MoO4]2–, since their central Mo6+ cation is situated at the 4a position. Due to this equal site multiplicity, the lanthanoid(III) cations have to be statistically under-occupied to maintain electroneutrality, thus a defect scheelite structure emerges. The partial structure of both the Ln3+ cations and the [MoO4]2– anions (if shrunk to their centers of gravity) can be best described as distorted diamond-like arrangements. Therefore, these two interpenetrating partial structures exhibit a similar setup as found in the zircon-type as well as in the NaTl-type structure.Item Open Access Composition and crystal structure of SmSb2O4Cl revisited : and the analogy of Sm1.5Sb1.5O4Br(2019) Goerigk, Felix C.; Schleid, ThomasThe quaternary halide‐containing samarium(III) oxidoantimonates(III) Sm1.3Sb1.7O4Cl and Sm1.5Sb1.5O4Br were synthesized through solid‐state reactions from the binary components (Sm2O3, Sb2O3 and SmX3, X = Cl and Br) at 750 °C in evacuated fused silica ampoules. They crystallize tetragonally in the space group P4/mmm, like the basically isotypic bismuthate(III) compounds SmBi2O4Cl and SmBi2O4Br, but show larger molar volumes and therefore contradict an ideal composition of “SmSb2O4X” (X = Cl and Br). Both single‐crystal X‐ray diffraction and quantitative electron‐beam microprobe analysis revealed the actual compositions of the investigated antimony(III) compounds, which can be understood as heavily Sm3+‐doped derivatives of “SmSb2O4X” hosts at the Sb3+ site. (Sm1)3+ is coordinated eightfold by oxygen atoms in the shape of a cube. The mixed‐occupied (Sb/Sm2)3+ cation has four oxygen atoms and four halide anions as neighbors forming a square antiprism. The oxygen atoms and anions establish alternating layers parallel to the ab‐plane, which alternate when stacked along [001].Item Open Access The matlockite-type praseodymium(III) oxide bromide PrOBr(2011) Talmon-Gros, Pia; Schurz, Christian M.; Schleid, ThomasThe crystal structure of PrOBr is described in this paper.Item Open Access Na3DyCl6(2011) Schurz, Christian M.; Meyer, Gerd; Schleid, ThomasIn this paper the crystal structure of trisodiumheyachloridodysprosat(III) (cryolite-type structure) is described as well as the method of perparation.Item Open Access A-type Ce2NCl3(2011) Schurz, Christian M.; Schleid, ThomasThe crystal structure of cerium nitride chloride (A-type) as well as the synthesis method is described in this paper.Item Open Access Single crystals of CaNa[ReO4]3 : serendipitous formation and systematic characterization(2019) Conrad, Maurice; Schleid, ThomasIn an attempt to crystallize Ce[ReO4]4·xH2O from aqueous solutions of equimolar amounts of Ce[SO4]2 and Ba[ReO4]2 via salt‐metathesis the serendipitous formation of colorless, transparent, rod‐shaped single crystals of CaNa[ReO4]3 was observed as a result of calcium and sodium impurities within the improperly deionized water used. Structure analysis by X‐ray diffraction lead to the conclusion that the title compound crystallizes in the ThCd[MoO4]3 structure type with the hexagonal space group P63/m and the lattice parameters a = 991.74(6) pm, c = 636.53(4) pm, c/a = 0.642 for Z = 2. The crystal structure contains purely oxygen surrounded and crystallographically unique cations, namely Ca2+ in tricapped trigonal prismatic (d(Ca-O) = 6 × 249 pm + 3 × 254 pm), Na+ in octahedral (d(Na-O) = 6 × 241 pm), and Re7+ in tetrahedral coordination (d(Re-O) = 171-173 pm). Furthermore, it was possible to yield an almost phase‐pure microcrystalline powder of the title compound from a melt of equimolar amounts of Na[ReO4] and Ca[ReO4]2 stemming from aquatically obtained precursors.Item Open Access Cs3Sm7Se12(2012) Schneck, Christof; Elbe, Andreas; Schurz, Christian M.; Schleid, ThomasThe crystal structure of Cs3Sm7Se12 is described in the paper.Item Open Access Crystal structure of tetracerium(III) trisulfide heptaoxodisilicate(IV), Ce4S3[Si2O7](2014) Hartenbach, Ingo; Schleid, ThomasCe4O7S3Si2, tetragonal, I41/amd (No. 141), a = 12.0543(8) Å, c = 14.2351(9) Å, V = 2068.4 Å3, Z = 8, Rgt(F) = 0.027, wRref(F2) = 0.060, T = 298 K.