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1998[X]
1Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur des Lanthan-Titanat-Tellurats LaTi  
 Abstract    (Ti0 2 5Te0j 5)O6 und seine Verwandtschaft mit PbSb20 6 und Sr(MnTe)06 Synthesis and Crystal Structure of the Lanthanum Titanate Tellurate LaTi(Ti0 25Te0 75) 0 6 and its Relationship to PbSb20 6 and Sr(M nTe)06 L. Single crystals of LaTi(Ti0 25T e o .75) 0 6 have been prepared by solid state reactions. X-ray investigations led to trigonal symmetry, space group C3-P3 , a = 5.141(10), c = 5.218(10) A, Z = 1. The compound is characterized by a predominantly ordered distribution of Ti4+ and Te6+. Typical features of the crystal structure are staggered layers containing edge connected T i0 6 and (Ti,Te)06 octahedra. The layers are connected by La3+ ions receiving an octahedral coordination by the surrounding oxygen ions. The relationships to the PbSb20 6 type and the recently described compound Sr(M nTe)06 are discussed. 
  Reference    Z. Naturforsch. 53b, 149—152 (1998); eingegangen am 25. November 1997 
  Published    1998 
  Keywords    Lanthanum, Titanate, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0149.pdf 
 Identifier    ZNB-1998-53b-0149 
 Volume    53 
2Author    G. Waidmann, M. JansenRequires cookie*
 Title    Synthese und Charakterisierung des Fulleren-Kokristallisats C60*SiH(C6H5)3 Synthesis and Characterisation of the Fullerene Co-Crystal C60*SiH(C6H5)3  
 Abstract    A new fullerene co-crystal C60*SiH(C6H5)3 has been synthesized by crystallisation from a melt of SiH(C6H5)3 and C60 in sealed duran tubes at 80°C. X-ray investigations led to triclinic symmetry, space group P i, a = 10.086(1),/? = 14.431(2), c = 14.911(2) Ä, a = 79.13(1), ß = 74.943(9), 7 = 88.33(1)°, V = 2058.0(4) A 3, Z = 2. The crystal structure consists of isolated fullerene and silane molecules. At -80°C, C60 is still rotationally disordered. Temperature dependent Guinier powder diagrams do not show any phase transformation between 25 and -165°C. The compound is stable in air. 
  Reference    Z. Naturforsch. 53b, 161—164 (1998); eingegangen am 14. November 1997 
  Published    1998 
  Keywords    Fullerene C60, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0161.pdf 
 Identifier    ZNB-1998-53b-0161 
 Volume    53 
3Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Isolierte trigonale S r 0 6-Prismen verknüpfen Kagome-Netze im Strontium-Manganat(I V)-Tellurat( VI): SrMnTe06 Kagome Layers Connected by Isolated Trigonal Sr06 Prisms in the Strontium Manganate(IV) Tellurate(VI): SrMnTe06 L  
 Abstract    Single crystals of the hitherto unknown compound SrM nT e06 have been prepared from Sr(0H)2-8H20 , M n C 0 3(aq) and T e 0 2 in air by crystallization below the melt range. X-ray in­ vestigations showed hexagonal symmetry, space group D3h-P62m, lattice constants a = 5.143(1), c = 5.384(2) A, Z = 1. SrM nTe06 is characterized by staggered [(Mn/Te)60 18] Kagome layers along [001]. These layers are connected by Sr2+ ions, resulting in S r0 6 prisms isolated from each other. The structure is discussed with respect to the connection of Kagome nets in the quaternary oxides of the Ba3Ln40 9 type. 
  Reference    Z. Naturforsch. 53b, 283—286 (1998); eingegangen am 7. November 1997 
  Published    1998 
  Keywords    Strontium, Manganese, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0283.pdf 
 Identifier    ZNB-1998-53b-0283 
 Volume    53 
4Author    B. Wedel, L. Wulff, Hk Müller-BuschbaumRequires cookie*
 Title    Isolierte ^[TeOs]-Oktaederketten im Bleitellurat Pb2T e05 Isolated ^ [Te05] Chains of Octahedra in the Lead Tellurate Pb2T e05  
 Abstract    Single crystals of Pb2T e0 5 have been prepared by flux techniques. X-ray investigations showed a new crystal structure with monoclinic symmetry, space group Cj-Cc, a = 13.099(3), b = 5.714(1), c = 7.520(2) Ä, ß = 123,80(3)°, Z = 4. Pb2T e 0 5 is characterized by o[o[Te05] chains of octahedra isolated from each other and incorporated into an edge, corner and face connected frame of P b 0 7 polyhedra. Possible positions o f the lone pair o f electrons of Pb2+ are estimated by calculations of Coulomb terms of lattice energy. 
  Reference    Z. Naturforsch. 53b, 287—290 (1998); eingegangen am 17. November 1997 
  Published    1998 
  Keywords    Lead, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0287.pdf 
 Identifier    ZNB-1998-53b-0287 
 Volume    53 
5Author    Thorsten Grob, FrankW. Eller, K. Urt, D. EhnickeRequires cookie*
 Title    Die Kristallstruktur von [Me3PN(H)PMe3]4l 28? einem Polyiodid mit I3~-, lg2--und I144"-Ionen Crystal Structure o f [M e3P N (H )P M e3]4I28, a Polyiodide w ith I3~, I82 -, and I 144~ Ions  
 Abstract    Black-red single crystals of [Me3PN(H)PMe3]4I28 have been prepared by the reaction of [Me3PNPMe3]I with iodine in dichloromethane solution in the presence of Me3SiI and traces of water. The polyiodide crystallizes triclinically in the space group Pi with two formula units per unit cell with the lattice dimensions a = 831.2(1), b = 1661.2(3), c = 1739.0(3) pm, q = 87.26(1)°, ß = 79.48(1)°, 7 = 78.17(1)°. The structure consists of [Me3PN(H)PMe3]2+ ions, linear I3~ ions, z-shaped I8: ~ ions, and zig-zag chains of I I44-ions, the terminal iodine atoms of which form I-H -N hydrogen bridges to the cations. 
  Reference    Z. Naturforsch. 53b, 552—556 (1998); eingegangen am 23. Februar 1998 
  Published    1998 
  Keywords    Polyiodide, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0552.pdf 
 Identifier    ZNB-1998-53b-0552 
 Volume    53 
6Author    Andreas Mommertz, Gertraud Geiseier, Klaus Harms, Kurt DehnickeRequires cookie*
 Title    Kristallstrukturen von Me2Si[N(SiMe3)2]2 und [Me2Si(NPh)(NHPh)LiOEt2]2 Crystal Structures of Me2Si[N(SiM e3)2]2 and [Me2Si(NPh)(NHPh)Li-OEt2]2  
 Abstract    The crystal structures of the title compounds are reported. Me2Si[N(SiMe3)2]2 : Space group Pbcn, Z = 4, lattice dimensions at 213 K: a = 1487.8(1), b = 1299.4(1), c = 1259.7(1) pm. The compound forms monomeric molecules with crystallographic C2 symmetry and Si-N bond lengths of 177.9(3), 171.6(3) and 175,2(3) pm. [Me2 Si(NPh)(NHPh)Li OEt2]2: Space group P2]/n, Z = 2, lattice dimensions at 190 K: a = 1082.7(3), b = 1038.8(2), c = 1641.3(4) pm, ß = 91.350(3)°. The compound forms centrosymmetric dimeric molecules in which the lithium atoms are members of a Li2N2 ring with Li-N bond lengths of 206.6(2) and 213.5(2) pm. The hydrogen atom at the nitrogen atom of the HNPh~ group is not involved in hydrogen bridging bonds. 
  Reference    Z. Naturforsch. 53b, 977—980 (1998); eingegangen am 29. Mai 1998 
  Published    1998 
  Keywords    Silylamine, Lithium Amide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0977.pdf 
 Identifier    ZNB-1998-53b-0977 
 Volume    53 
7Author    Regina Bettenhausen, Wolfgang Milius, Wolfgang SchnickRequires cookie*
 Title    Synthese und Kristallstruktur von [H2NMe2]+[(Me2 NH)2 TiCl4 ]_ Synthesis and Crystal Structure of [H2NMe2]+[(Me2NH)2TiCl4]~  
 Abstract    The title compound has been synthesized as a green solid by the reaction of M eCl2 SiNHSiM e3 and Ti(NM e2)4 in CH2C12. The crystal structure was determined by single crystal X-ray methods at room temperature (C2/c, a = 1825,7(4), b = 909,9(2), c = 1116,1(2) pm, ß = 125,09(3)°, Z = A,R\= 0,047, wR2 = 0,147) to be an ionic salt [H2NMe2]+[(Me2NH)2TiCl4]" . The central titanium(III) atom of the anion is bound to four Cl atoms and weakly coordinated by two Me2NH ligands. 
  Reference    Z. Naturforsch. 53b, 239—241 (1998); eingegangen am 20. November 1997 
  Published    1998 
  Keywords    N-Silyl Amides, Crystal Structure, Titanium 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0239.pdf 
 Identifier    ZNB-1998-53b-0239 
 Volume    53 
8Author    Z. NaturforschRequires cookie*
 Title    Untersuchungen an Polyhalogeniden, X X X IY  
 Abstract    [1] Cäsium(18-Krone-6)dichloroiodat(I), [Cs(C12H 240 6)]IC12 S tu d ies o n P olyhalides, X X X IV [1] C e siu m (1 8 -cro w n -6)d ich lo ro io d ate , [C s(C 12H 240 6)]IC12 M e rv a t E l E ssa w i3, K arl-F rie d ric h T e b b e * b a Chemical D epartm ent, The new compound [Cs(18-crown-6)]ICl2 has been prepared by the reaction of cesium chloride and 18-crown-6 with iodine chloride in ethanol and structurally characterized by X-ray diffrac­ tion methods. The geometries of the cation [Cs(18-crown-6)]+ and of the anion IC12~ are as expected. 
  Reference    Z. Naturforsch. 53b, 263—265 (1998); eingegangen am 5. November 1997 
  Published    1998 
  Keywords    Polyhalogenide, Dichloroiodate, Crown Complex, Cesium Compound, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0263_n.pdf 
 Identifier    ZNB-1998-53b-0263_n 
 Volume    53 
9Author    R. Rettich, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kristallchemie der Silber-Mangan-Oxovanadate Ag2BaMnV20 8 und (AgCa2)Mn2(V 04)3 On the Crystal Chemistry of the Silver Manganese Oxovanadates Ag?BaMnV?Oo and (AgCa2)Mn2(V 0 4)3  
  Reference    Z. Naturforsch. 53b, 291—295 (1998); eingegangen am 12. Januar 1998 
  Published    1998 
  Keywords    Barium, Calcium, Manganese, Vanadium Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0291.pdf 
 Identifier    ZNB-1998-53b-0291 
 Volume    53 
10Author    Z. NaturforschRequires cookie*
 Title    Kristallstruktur  
 Abstract    von [Mo(CO)3(NCMe)(SrBu)]2 C ry stal S tru c tu re o f [M o (C O)3(N C M e)(S rB u)]2 M ike R. K opp, B e rn h a rd N eu m ü ller* Single crystals of [M o(CO)3(NCM e)(S'Bu)]2 (1) and [{Mo(CO)3}2{Mo(CO)2}{S'Bu}4] (2) were obtained by the reaction of [M o(CO)3(NCM e)3] with [(PhCH2)2GaS'Bu]2 in 1,4-dio-xane. The X-ray structure determination of 1 showed the presence of a Mo2S2 four-membe-red ring with a Mo-Mo bond length of 296,7(1) pm. Space group Pbca, Z = 4, lattice dim en­ sions at -80 °C: a = 1588,2(3), b = 905,8(1), c = 1676,0(1) pm, R y = 0,0555. 
  Reference    Z. Naturforsch. 53b, 378—380 (1998); eingegangen am 8. Dezember 1997 
  Published    1998 
  Keywords    Molybdenum Carbonyl Complex, Thiolato Complex, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0378.pdf 
 Identifier    ZNB-1998-53b-0378 
 Volume    53 
11Author    R. Rettich, Hk Müller-BuschbaumRequires cookie*
 Title    Darstellung und Strukturbeschreibung von NaCa3 Mn(V2O7)(V3 O10) Preparation and Structure o f NaCa3M n(V2O 7)(V3O 10)  
 Abstract    Single crystals of NaCa3Mn(V2O7)(V3O 10) have been prepared by crystallization from flux in argon atmosphere. X-Ray single crystal methods led to triclinic symmetry, space group C '-P l, 
  Reference    Z. Naturforsch. 53b, 507—511 (1998); eingegangen am 22. Januar 1998 
  Published    1998 
  Keywords    Sodium, Calcium, Manganese, Vanadium Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0507.pdf 
 Identifier    ZNB-1998-53b-0507 
 Volume    53 
12Author    M. Staack, Hk Müller-BuschbaumRequires cookie*
 Title    Ba4M n2Ag20(As04)4? ein Barium-Mangan-Oxid-Arsenat mit nichtlinearen O-Ag-O-Hanteln. Ba4Mn2Ag2 0 (As0 4 )4, a Barium Manganese Oxide-Arsenate Showing Nonlinear O-Ag-O Dumbbells  
 Abstract    Single crystals of Ba4Mn2 Ag20 (A s04)4 have been prepared by solid state reactions using me­ tallic silver as reactant. X-ray techniques led to monoclinic symmetry, space group D2h-P2,/m, 
  Reference    Z. Naturforsch. 53b, 512—516 (1998); eingegangen am 29. Januar 1998 
  Published    1998 
  Keywords    Barium, Manganese, Silver, Oxide-Arsenate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0512.pdf 
 Identifier    ZNB-1998-53b-0512 
 Volume    53 
13Author    Hk Sfreddo, Müller-BuschbaumRequires cookie*
 Title    Indium partiell in tetraedrischer Sauerstoffkoordination in BaIn2Zn30 7 . Eine Betrachtung zum Ba2Ln2Zn80 13/BaLnAlZn3 0 7 -Typ Partial Tetrahedral Oxygen Coordination of Indium in BaIn2Zn30 7. A Consideration of the Ba2Ln2Zn80 13/BaLnAlZn30 7 Type O  
 Abstract    Single crystals of BaIn2Zn30 7 have been prepared by solid state reaction and crystallization from flux. X-ray investigations led to hexagonal symmetry, space group C6V-P6 3mc, lattice constants a = 6.342(1), c = 10.282(1) A, Z = 2. BaIn2Zn30 7 shows tetrahedral positions statistically occupied by In3+ and Zn2+. The crystal structure is isotypic to Ba2Ln2Zn80 13 and BaLnAlZn30 7. A discussion of the related compounds is given. 
  Reference    Z. Naturforsch. 53b, 517—520 (1998); eingegangen am 29. Januar 1998 
  Published    1998 
  Keywords    Barium, Indium, Zinc, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0517.pdf 
 Identifier    ZNB-1998-53b-0517 
 Volume    53 
14Author    S. Meyer, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kenntnis eines Vanadyl-Oxocuprat-Phosphats CaCu  
 Abstract    (V0)(P0 4) 2 mit Cu2+ auf Positionen der V 0 2+-Ionen und einer kupferreicheren Phase CaCulvt3(VO)o,87(P04)2 On an Vanadyl Oxocuprate Phosphate C aC u(V 0)(P 04)2 Containing Cu2+ at Positions of V 0 2+ Ions and a Copper Rich Phase CaCu, !3(VO)0 g7(P04)2 Single crystals of CaCu(V 0)(P04)2 (I) and CaCu,.i3(VO)o.87(P04)2 (II) have been prepared using solid state reactions in closed and evacuated quartz tubes. X-ray characterization led to 
  Reference    Z. Naturforsch. 53b, 521—526 (1998); eingegangen am 4. Februar 1998 
  Published    1998 
  Keywords    Calcium, Copper, Vanadyl-Phosphate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0521.pdf 
 Identifier    ZNB-1998-53b-0521 
 Volume    53 
15Author    B. Wedela, K. Sugiyamaa, Hk Müller-BuschbaumRequires cookie*
 Title    Verknüpfung von (Te06)6-und (Te06)3(N i06)3-Sechsringen durch TeNiOp-Oktaederdoppel in Pb3Ni4i5Te2? 5 0 15 Connection of (TeOö)6 and (Te06)3(N i0 6)3 Hexagons by T eN i09 Octahedra Double in Pb3Ni4 5Te2 50 15  
 Abstract    Single crystals of Pb3Ni4 5Te2 5 0 15 have been prepared by heating pellets of mixtures of PbO, T e02 and nickel hydroxide carbonate to 730 °C in air. X-ray investigations led to hexagonal 
  Reference    Z. Naturforsch. 53b, 527—531 (1998); eingegangen am 11. Februar 1998 
  Published    1998 
  Keywords    Lead, Nickel, Tellurium Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0527.pdf 
 Identifier    ZNB-1998-53b-0527 
 Volume    53 
16Author    Tristram Chivers, Xiaorong Li, Masood ParvezRequires cookie*
 Title    Preparation and X-Ray Structure of 3,5-Dimethyl-1,4-dichloro-1,2,6- thiadiazine-1 -oxide  
 Abstract    The title compound was obtained by the reaction of 3,5-dimethyl-2//-l,2,6-thiadiazine-l,l-dioxide with PCI5 in chloroform. It crystallizes in the monoclinic system, space group P2\/c, a = 7.521(7) A, b = 8.400(4) A, c = 13.908(4) Ä, ß = 100.35(4)°, V = 864.4(8) A3, and Z = 4. The S(VI) atom lies 0.43 A out of the plane of the 7r-delocalized NCCCN unit. The mean S-N bond distance is 1.569(3) A. 
  Reference    Z. Naturforsch. 53b, 532—534 (1998); received December 18 1997 
  Published    1998 
  Keywords    Crystal Structure, 1, 2, 6-Thiadiazines, Sulfanuric Chloride 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0532.pdf 
 Identifier    ZNB-1998-53b-0532 
 Volume    53 
17Author    Reinhold Tacke, Joachim Heermann, Melanie PiilmRequires cookie*
 Title    Pentafluoro[(4-methyl-1,4-bisazoniacy clohex-1 -yl)methy 1] germanate Hydrate: Synthesis and Crystal Structure of a Zwitterionic A6Ge-Germanate with a GeF5C Framework  
 Abstract    The zwitterionic (molecular) A6Ge-germanate pentafluoro[( 
  Reference    Z. Naturforsch. 53b, 535—539 (1998); received December 17 1997 
  Published    1998 
  Keywords    Hexacoordinate Germanium, Zwitterion, Preparation, Crystal Structure 
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 Identifier    ZNB-1998-53b-0535 
 Volume    53 
18Author    MikeR. Kopp, Bernhard NeumüllerRequires cookie*
 Title    Benzylgallium-Verbindungen. Die Kristallstrukturen von [Mg3Br2  
 Abstract    ,4Cl1,6(OEt2)6][Ga(CH2Ph)4]2 • 0,5 Toluol und [(3,5-Me2C6H3CH2)2GaBr]2 Benzylgallium Compounds. The Crystal Structures of [Mg3Br2 4C1 j 6(OEt2)6][Ga(CH2Ph)4]2 • 0.5 Toluene and [(3,5-Me2C6H3CH2)2GaBr]2 [Mg3Br2 4C1] 6(OEt2)6][Ga(CH2Ph)4]2-0.5 toluene (1) can be obtained by the reaction of one equivalent of GaCl3 with four equivalents of PhCH2MgBr in Et20 . Recrystallization of the crude product from toluene at 60°C gives colorless crystals of 1. Treatment of GaCl3 with two equivalents 3,5-Me2C6H3CH2MgBr in Et20 gives after recrystallization from toluene the diorganogallium bromide [(3,5-Me2C6H3CH2)2GaBr]2 (2). 1 and 2 were characterized by NMR, IR and MS techniques as well as by X-ray structure analyses. 1 consists in the dication [Mg3Br2 4C1, 6(OEt2)6]2+, two gallate units [Ga(CH2Ph)4]_ and a toluene molecule, disordered around a center of inversion. 2 forms centrosymmetric dimers [(3,5-Me2C6H3CH2)2GaBr]2. 
  Reference    Z. Naturforsch. 53b, 545—551 (1998); eingegangen am 5. Februar 1998 
  Published    1998 
  Keywords    Gallium Compounds, Magnesium Compound, Crystal Structures 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0545.pdf 
 Identifier    ZNB-1998-53b-0545 
 Volume    53 
19Author    V. Erena, M.T T Hiede, W. Olfgang, JeitschkoRequires cookie*
 Title    Ternary Intermetallic Compounds L«Mn2Ali0 (Ln = Y, La-Nd, Sm, Gd-Dy) and L«Re2Al10 (Ln = Ce, Pr, Sm) with CaCr2Al10-Type Structure  
 Abstract    The twelve title compounds have been prepared for the first time. Their CaCnA lio-type structure (PA/nm m, Z = 4) was refined from single-crystal X-ray data for the three representatives TbM mAlio (a = 1274.3(2) pm, c = 511.4(2) pm, R = 0.025 for 680 structure factors F and 43 variable parameters VO, CeRe2Alio (a -1295.5(5) pm, c -517.2(4) pm, R = 0.054 for 810 F a n d 46 V), and SmReaAlio (a = 1291.5(2) pm, c = 516.5(1) pm, R = 0.021 for 622 F and 46 V). The atomic positions of the lanthanoid and transition metal atoms are fully occupied. Significant deviations from the full occupancies were observed for two aluminum sites in TbM mAlio and for all five aluminum sites of the two rhenium-containing compounds, resulting in the compositions TbMn2Al9.63(2), CeRe2Al9.52(8), and SmRe2Al9.i6< 9)-The cell volume of CeRe2Alio and to a smaller extent also that of CeMm A1 io indicate mixed or intermediate +III/+IV valencies of the cerium atoms in these compounds. The structural relationships between the three closely related body-centered tetragonal structures of ThM ni2, CeMn-iAlx, DyFeöAU, and the primitive tetragonal structure of CaCnA lio are briefly discussed. 
  Reference    Z. Naturforsch. 53b, 673—678 (1998); received February 2 1998 
  Published    1998 
  Keywords    Intermetallic Compounds, Crystal Structure, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0673.pdf 
 Identifier    ZNB-1998-53b-0673 
 Volume    53 
20Author    Francoanellite K^alschpo^cpo, Stefan Dicka, Thomas ZeiskebRequires cookie*
 Title    Francoanellit K3A15HP04)6(P04)2*12H20: Struktur und Synthese durch topochemische Entwässerung von Taranakit-I 2 H2O: Structure and Synthesis by Topochemical Dehydration of Taranakite  
 Abstract    Single crystals of synthetic francoanellite K3Al5(HP0 4)6(P0 4)2-12H20 could be obtained for the first time by topochemical dehydration of taranakite crystals. An X-ray structure de­ termination showed francoanellite to be the mineral with the second longest crystallographic axis described hitherto. Crystal data: space group R3c, a = 869.0(2), c = 8227(1)pm, Z = 6 , R g = 0.042. Francoanellite is a layer structure mineral having six layers of composition [K3Al5(HP04)6(P04)2(H2 0)i2], connected by hydrogen bonds. The rigid layer is formed by columns of corner sharing hydrogen phosphate tetrahedra and AIOö-octahedra which are inter­ connected by additional six-coordinated A1 ions. In trigonal holes of the layer orthophosphate ions are situated. The structure of francoanellite is very similar to the structure of taranakite K3H6Al5(P04)8-18H20 which has planar water interlayers between the Al-phosphate layers. A neutron scattering experiment with subsequent Rietveld refinement of the powder pattern gave the H-atom positions. Hydrogen bonds in francoanellite are formed within the rigid layers and between them. During the reaction taranakite —► francoanellite crystals in an intermediate stage of dehy­ dration could be obtained. From the c-axis of 8858 pm and one-dimensional electron density projections it can be proposed that in these crystals every second water interlayer was lost and a first order staging product of the deintercalation of water from taranakite was formed. 
  Reference    Z. Naturforsch. 53b, 711—719 (1998); eingegangen am 2. März 1998 
  Published    1998 
  Keywords    Crystal Structure, Neutron Scattering, Francoanellite, Taranakite, Topochemical Reaction 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0711.pdf 
 Identifier    ZNB-1998-53b-0711 
 Volume    53 
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