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1Author    Sabine Rings3, Vladislav Ischenkob, Martin Jansenb, Sonderdruckanforderungen An, ProfM. JansenRequires cookie*
 Title    Darstellung und Strukturanalyse von Lithium- [tetrakis-(methylamino-)aluminat] Preparation and Crystal Structure of Lithium[tetrakis-(methylamino-)aluminate]  
 Abstract    The preparation and spectroscopic data of the new ternary amide LiAl(NHCH3)4 are reported. The structure of the title compound has been determined from X-ray powder diffraction data (tetragonal, 14,, a = 14.000(4) A, c = 9.275(2) A, 210 reflections, R = 3.75%, weighted R = 5.10%). Both the lithium and the aluminium atoms are coordinated tetrahedrally by nitrogen atoms. Edge-sharing pairs of lithium centered and aluminium centered tetrahedra are connected to each other in helical chains forming a 3D-framework via the remaining vertices. A comparison of the projection of the crystal structure of LiAl(NHCH3)4 along the c-axis to those of cristobalite and of hollandite, (Ba,K)2 (M n,Fe)80 16, reveals similarities with respect to both the connectivity and the topology of ring structures. 
  Reference    Z. Naturforsch. 55b, 730—734 (2000); eingegangen am 20. April 2000 
  Published    2000 
  Keywords    Amides, Lithium, Aluminium 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0730.pdf 
 Identifier    ZNB-2000-55b-0730 
 Volume    55 
2Author    Ž. Blažina, Z. BanRequires cookie*
 Title    The Crystal Structures of U2Cu3 AL and UCUA12, and their Relationship with Some Other Phases in the System U-Cu-Al  
 Abstract    X-ray investigations of a great number of samples along the specifically chosen tie-lines in the isothermal sections of the system U-Cu-Al (800 °C) indicated the existence of two new ordered ternary phases, i.e. U2CU3A1 and UCUA12. The first one is hexagonal (S. G. P63/mmc, MgZn2-type), with a = 5.065 ± 0.005 A, c = 8.307 ± 0.005 A and c/a = 1.640. The ordered atomic arrangement of all atoms, as confirmed by trial and error method is consistent with a rather uncommon superstructure of the MgZn2-type. UCUA12 is tetragonal, a = 3.857 ± 0.005 A, c = 8.736 ± 0.005 A, c/a = 2.265, probable space group is I4/mmm, and represents an ordered ternary structure variant of the TiAl3 type. The crystal structures of these two new phases were correlated, in terms of stacking sequences, with those which were identified in this system previously. 
  Reference    Z. Naturforsch. 35b, 1162—1165 (1980); received March 3 1980 
  Published    1980 
  Keywords    Aluminium, Copper, Uranium, Intermetallic Compound 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1162.pdf 
 Identifier    ZNB-1980-35b-1162 
 Volume    35 
3Author    K. B. Plötz, Hk Müller-BuschbaumRequires cookie*
 Title    Oxoplumbate(II), IV Einbau von Sr 2+ in Pb9Al8021 Solid State Chemistry of Oxoplumbates(II), IV Incorporation of Sr 2+ in Pb9Al802i  
  Reference    (Z. Naturforsch. 37b, 108—109 [1982]; eingegangen am 29. September 1981) 
  Published    1982 
  Keywords    Crystal Structure, Lead, Aluminium, Strontium 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0108_n.pdf 
 Identifier    ZNB-1982-37b-0108_n 
 Volume    37 
4Author    V. P. Tarasov, V. I. Privalov, G. A. Kirakosyan, YuA. BuslaevRequires cookie*
 Title    Scalar Second-Kind Relaxation of 27 A1, 69 Ga and 71 Ga Nuclei in Aluminium and Gallium Complexes  
 Abstract    Spin-spin and spin-lattice relaxation times of nuclei 69 > 71 Ga, 27 A1, 14 N in anions [MClnBr4_n]-and the solvate complexes [M(CH3CN)6] 3+ , produced from dissolution of MCI3 and MBr3 in the mixture CH3CN + CH3N02 (M = Ga, Al), are measured in the temperature range from —40 up to + 70 °C. It is shown that nuclear spins of 69 > 71 Ga, 27 A1 relax in the anionic and cationic complexes by means of the second-kind scalar and quadrupole relaxation mechanisms (due to the relaxation of the nuclei 35 ' 37 C1, 79 ' 81 Br, 14 N). The complexes [MClwBr4_n]-and [M(CH3CN)6] 3+ in the investigated solutions are inert and do not undergo exchange processes in the NMR time scale. The scalar spin coupling constants in [M(CH3CN)6] 3+ are determined from the scalar contribution to the relaxation rate of 69 -71 Ga, 27 A1, and the measured relaxation time of 14 N in the solvate complex; the results are Ga-14 N) -59 ± 5 Hz, J(71 Ga-14 N) = 74 ± 6 Hz, J(27 Al-i 4 N) = 22 ± 2 Hz. 
  Reference    Z. Naturforsch. 38b, 1173—1181 (1983); received May 3 1983 
  Published    1983 
  Keywords    Aluminium, Gallium, Relaxation, NMR 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1173.pdf 
 Identifier    ZNB-1983-38b-1173 
 Volume    38 
5Author    Hk Müller-Buschbaum, W. SchmachtelRequires cookie*
 Title    Über Erdalkalimetalloxogallate, VI Zum Problem der Mischkristallbildung zwischen CaGa204 und CaAl204 On Alkaline Earth Metal Oxogallates, VI About Mixed Crystal Formation of CaGa204-CaAl204  
 Abstract    Mixed crystals of the formulae CaGaA104 (1) and CaGao.5Al1.5O4 (2) were investigated by X-ray single crystal work. 1 shows a tetrahedral orientation like that of CaGa 2 0 4 (monokl.), 2 another one of CaAl 2 04. A discussion of the different polyhedral arrangement of the stuffed tridymite structures is given. 
  Reference    (Z. Naturforsch. 31b, 1604—1606 [1976]; eingegangen am 2. September 1976) 
  Published    1976 
  Keywords    Aluminium, Calcium, Gallium Oxide, Mixed Crystals, X-ray 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1604.pdf 
 Identifier    ZNB-1976-31b-1604 
 Volume    31 
6Author    Hk Müller-Buschbaum, M. HarderRequires cookie*
 Title    Zur Kenntnis von Ba2Fe2 Fe9 3 Aln034 About Ba2Fe2 2+ Fe9 3+ Alii034  
 Abstract    Single crystals of the compound Ba2FenAln034 were prepared by solid state reac-tion (1700 °C) of Ba0-Fe203-Al203 mixtures. The crystal structure was investigated by X-rav data (space group D6h-P63/mmc, lattice constants: a = 565.3, c = 2281.0 pm). Ba2FenAln034 is isotypic with Na20 • 11 AI2O3, the structure of)S-alumina. 
  Reference    Z. Naturforsch. 33b, 146—148 (1978); eingegangen am 8. Dezember 1977 
  Published    1978 
  Keywords    Barium, Iron, Aluminium, X-ray, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0146.pdf 
 Identifier    ZNB-1978-33b-0146 
 Volume    33 
7Author    Ch Rabbow, HkM. Üller-B, UschbaumRequires cookie*
 Title    Zur Kenntnis eines Barium-Lanthanoid-Aluminat-Zinkats: BaLuAlZn30 7 mit einem Anhang zu Ba2Er2Zn80 13  
 Abstract    Reactions of B aC 03, ZnO, Lu20 3 and A120 3 mixtures at temperatures up to 1500 °C led to small and colourless rods of BaLuAlZn30 7. The new compound crystallizes with hexagonal symmetry, space group CöV -P63mc, a = 6.273, c =10.161 A, Z = 2. In spite of small differences in the oxygen content BaLuAlZn30 7 is isotypic to Ba2Ln2Zn80 13. The crystal structure shows Zn2+ with tetrahedral, Lu '+ with octahedral and Ba:+ with anticuboctahedral coordination by 0 2~. It has been shown that parts of the [Zn3A107]5_ network are fragments of the ZnO structure. In consequence one oxygen atom is fourfold coordinated by zinc/aluminium. The space group of Ba2Ln2ZnxO i3 must be corrected to C6V -P63mc. 
  Reference    Z. Naturforsch. 51b, 343—347 (1996); eingegangen am 27. Juli 1995 
  Published    1996 
  Keywords    Barium, Rare Earth, Zinc, Aluminium, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0343.pdf 
 Identifier    ZNB-1996-51b-0343 
 Volume    51 
8Author    Ch Rabbow, S. Panzer, H.K M Üller-, Busch-BaumRequires cookie*
 Title    Röntgenstrukturanalyse von zwei Verbindungen des  
 Abstract    Kupfertyps BaMLn20 5 (M = Zn, Ln = Sm, Tm) und von BaSmAIZn30 7 X -R ay A nalysis of Two C om pounds of the C o p p er Type B aM L n20 5 (M = Z n, Ln = Sm, Tm) and of B aS m A lZ n 30 7 The barium zinc lanthanoide oxides BaZnSm20 5 (I) and BaZnTm20 5 (II) crystallize in the BaCuLn20 3 copper type with orthorhom­ bic symmetry, space group D^-Pnma, (I): a = 12.575(2), b = 5.804(1), c = 7.198(1) A and (II): a = 12.258(2), b = 5.684(1), c = 7.010(2) A, Z = 4. Zinc shows square pyramidal oxygen coordina­ tion, but the strong elongation of the C u 0 5 pyra­ mid in the copper type is missing. BaSmAlZn30 7 crystallizes in the space group C6V -P63mc, a = 6.346(1), c = 10.237(3) Ä, Z = 2. The metal coordi­ nation of oxygen and the shifts of the ratio Al : Zn at the sites (6c) and (2a) depending on the size of the lanthanoid ions are discussed. 
  Reference    Z. Naturforsch. 52b, 546—548 (1997); eingegangen am 30. Dezember 1996 
  Published    1997 
  Keywords    Barium, Rare Earth, Zinc, Aluminium, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0546_n.pdf 
 Identifier    ZNB-1997-52b-0546_n 
 Volume    52