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  • Chemistry  (227)
  • General Chemistry  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 88 (1976), S. 345-345 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 572 (1989), S. 181-185 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: About BaNiDy2O5 and BaNiLu2O5 with Octahedral and Tetragonal Pyramidal Coordinated Ni2+(I) BaNiDy2O5 and (II) BaNiLu2O5 were prepared for the first time and investigated by X-ray single crystal technique. [I: a = 3.773; b = 5.777; c = 11.352 Å; Z = 2; space group D2h25 - Immm; II: a = 6.931; b = 12.109; c = 5.634 Å; Z = 4; space group D2h16-Pbnm]. I crystallizes with an octahedral coordination of Ni2+ by O2-, II on the contrary is surrounded by a tetragonal pyramidal oxygen environment. II belongs to the series of BaCuLn2O5 compounds.
    Notes: (I) BaNiDy2O5 und (II) BaNiLu2O5 wurden erstmals dargestellt und mit Einkristallröntgenbeugungsmethoden untersucht [I: a = 3,773; b = 5,777; c = 11,352 Å; Z = 2; Raumgruppe D2h25-Immm; II: a = 6,931; b = 12,109; c = 5,634 Å; Z = 4; Raumgruppe D2h16-Pbnm]. I kristallisiert mit oktaedrisch koordiniertem Ni2+, II dagegen mit der Koordinationszahl 5 in Form einer tetragonalen Pyramide. II gehört somit zur Reihe der BaCuLn2O5-Verbindungen.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 584 (1990), S. 7-11 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Compounds of the Ba8Pt4Y3O17.5-Type: Ba8Pt4Ln3O17.5 · (Ln = Er, Yb, Tm)The hitherto unknown compounds (I):Ba8Pt4Er3O17.5, (II): Ba8Pt4Yb3O17.5 and (III): Ba8Pt4Tm3O17.5 were prepared and investigated by single crystal X-ray technique. They crystallize with cubic symmetry; space group Oh1-Pm3m, Z = 1. (I): a = 8.3441 Å; (II): a = 8.3145 Å; (III): a = 8.3296 Å. Pt4+ and Ln3+ ions show an octahedral and Pt2+ ions a planar coordination by oxygen. A typical feature of the crystal structure is an unoccupied space in the middle of the unit cell.
    Notes: Die bisher unbekannten Verbindungen (I): Ba8Pt4Er3O17,5, (II): Ba8Pt4Yb3O17,5 und (III): Ba8Pt4Tm3O17,5 wurden einkristallin dargestellt und röntgenographisch untersucht. Sie gehören zur Raumgruppe Oh1-Pm3m (I): a = 8,3441 Å; (II): a = 8,3145 Å; (III): a = 8,3296 Å; Z = 1. In diesen Verbindungen sind Pt4+- und Ln3+-Ionen oktaedrisch und Pt2+-Ionen planar durch Sauerstoff koordiniert. Die Kristallstruktur zeichnet sich durch einen Hohlraum in der Mitte der Elementarzelle aus.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 71-77 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ba5(Ir, Ru)3O12: A New Crystal Structure with Isolated OctahedratripelA new compound, Ba5(Ir, Ru)3O12 was prepared and investigated by single crystal X-ray work (space group D2h16-Pnma; a = 10.853; b = 5.897; c = 19.819 Å; Z = 4). „Isolated“ octahedratripel of face connected [Ir/RuO6] groups are characteristic to this oxide. Ir and Ru are in statistic distribution. One of these metal positions contains an access of Ir, the other two of Ru, respectively. Coulomb Energy calculations show a dominant oxidation state +4 on one of the three Ir/Ru-point positions.
    Notes: Die neue Verbindung Ba5(Ir, Ru)3O12 wurde dargestellt und mit Röntgenmethoden an Einkristallen untersucht (Raumgruppe D2h16-Pnma; a = 10,853; b = 5,897; c = 19,819 Å; Z = 4). Flächenverknüpfte [Ir/RuO6]-Gruppen bilden Oktaedertripel, die „isoliert“ auftreten und ein typisches Strukturmerkmal darstellen. Ir und Ru sind statistisch verteilt, eine der Punktlagen enthält einen Überschuß an Ir, die zwei anderen an Ru. Berechnungen der Coulomb-Energie zeigen, daß eine der durch Edelmetalle besetzten Punktlagen die Ladung +4 enthält.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 573 (1989), S. 89-94 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Structure on Barium Lanthanoid Aluminates: Ba6Dy2Al4O15Ba6Dy2Al4O15 was prepared and investigated by X-ray single crystal technique. It shows a new structure type and belongs to the space group D2h17-Cmcm; a = 5.898; b = 10.183; c = 14.877 Å; Z = 2. The crystal structure of this compound is determined by a BaO-network consisting of 8+1 coordinated Ba2+ ions. Furthermore by corner connected double-tetrahedra around Al3+ and isolated Dy3+ octahedra. One of the oxygen pointpositions is partially occupied by O2- and belongs only to the Ba2+ ions.
    Notes: Mit Einkristall-Röntgenbeugungsmethoden wurde an Ba6Dy2Al4O15 ein neuer Strukturtyp gefunden. Es kristallisiert orthorhombisch, Raumgruppe D2h17-Cmcm, a = 5,898; b = 10,183; c = 14,877 Å, Z = 2. Den Aufbau dieser Verbindung bestimmt ein BaO-Gerüst mit einer 8+1-Sauerstoffkoordination um Ba2+, ferner eckenverknüpfte Doppeltetraeder um Al3+ und isolierte Oktaeder um Dy3+. Ein O2- auf einer partiell besetzten Punktlage ausschließlich zu den Ba2+-Ionen.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 575 (1989), S. 26-30 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ni5HfB2O10 with Ordered Metal DistributionNi5HfB2O10 was prepared for the first time and investigated by X-ray methods. It crystallizes with orthorhombic symmetry, space group D2h16 - Pnma, a = 9.328; b = 6.120; c = 12.334 Å; Z = 4. In opposition to the Ni5TiB2O10-type all metal point positions are strongly ordered. The authors are in doubt about the partly statistic metal distribution within Ni5M4+B2O10 (M4+ = Ti, Zr, Ge).
    Notes: Ni5HfB2O10 wurde erstmals dargestellt und an Einkristallen untersucht. Ni5HfB2O10 kristallisiert orthorhombisch, Raumgruppe D2h16 - Pnma, a = 9,328; b = 6,120; c = 12,334 Å, Z = 4. Im Gegensatz zum Ni5TiB2O10-Typ weist NiHfB2O10 eine total geordnete Metallverteilung auf. Die partiell statistische Verteilung von Ni2+ mit M4+ (M4+ = Ti, Zr, Ge) wird in Frage gestellt.
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure Investigations of Compounds with the A3(M, Nb)8O21-Type (A = Tl, Ba; M = Fe, Ni)Tl3Fe0,5Nb7,5O21 (A), a hitherto unknown phase of the A3(M, Nb)8O21-type, and Ba3Fe2Nb6O21 (B), Ba3Ni1.33Nb6,66O21 (C) were prepared and investigated by single crystal X-ray technique. ((A): a = 9.145(1), c = 11.942(1) Å; (B): a = 9.118(2), c = 11.870(1) Å; (C) a = 9.173(3), c = 11.923(1) Å, space group D6h3—P63/mcm, Z = 2). There is a statistic occupation of the M-positions by Nb5+ and Fe3+ or Nb5+ and Ni2+, respectively. An other compound Ba3Fe2Ta6O21 is partially ordered in respect to Ta5+ and Fe3+. Calculations of the Coulomb-part of lattice energy are discussed.
    Notes: Aus dem Bereich der A3M8O21-Verbindungen wurde erstmals Tl3Fe0,5Nb7,5O21 (A) dargestellt. Zusätzlich wurden auch Ba3Fe2Nb6O21 (B) und Ba3Ni1,33Nb6,66O21 (C) an Einkristallen mit Röntgenbeugungsmethoden untersucht. ((A): a = 9,145(1), c = 11,942(1) Å; (B): a = 9,118(2), c = 11,870(1) Å; (C): a = 9,173(3), c = 11,923(1) Å, Raumgruppe D6h3—P63/mcm, Z = 2). Nb5+ verteilt sich mit Fe3+ bzw. Ni2+ statistisch auf die M-Positionen. Die Verbindung Ba3Fe2Ta6O21 ist bezüglich Ta5+ und Fe3+ partiell geordnet. Berechnungen des Coulombanteils der Gitterenergie werden diskutiert.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 588 (1990), S. 97-101 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ordered Occupation of Octahedra in Ba6La2Al1,5Fe2,5O15Ba6La2Al1.5Fe2.5O15 was prepared and investigated by X-ray single crystal technique. It crystallizes in the space group C6v4 - P63mc; a = 11.814, c = 7.1003 Å; Z = 2. The M3+O6 octahedra are occupied exclusively by Fe3+ ions, the M3+O4 tetrahedra in contrast are statistically filled by Fe3+ and Al3+ ions. Ba6La2Al1.5Fe2.5O15 is a partially ordered mixed crystal of the pure iron and aluminium compounds.
    Notes: Ba6La2Al1,5Fe2,5O15 wurde einkristallin dargestellt und mit röntgenographischen Methoden die Metallverteilung untersucht. Es kristallisiert in der Raumgruppe C6v4 - P63mc; a = 11,814, c = 7,1003 Å; Z = 2. Fe3+ besetzt ausschließlich Oktaederpositionen, die im Strukturtyp vorkommenden M3+O4-Tetraeder sind durch Al3+ und Fe3+ statistisch besetzt. Ba6La2Al1,5Fe2,5O15 ist ein partiell geordneter Mischkristall aus den reinen Eisen- und Aluminiumverbindungen.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 583 (1990), S. 17-23 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Strontium-Oxometallate: Sr9Zn4Cu2O14, Containing Sr2+ in Face Connected OctahedraSingle crystals of Sr9Zn4Cu2O14 were prepared in closed Cu-tubes. Modern X-ray investigations lead to monoclinic symmetry (space group C2h3—C2/m, a = 22.22; b = 3.61; c = 11.29; β = 98.6°; Z = 2). The crystal structure is characterized by a threedimensional Sr/O network, containing Sr2+ in octahedral and trigonal prismatic coordination. The SrO6 octahedra are partly face connected. Incorporated Zn2+ and Cu+ Ions show tetrahedral and dumbbell like coordination.
    Notes: In geschlossenen Cu-Rohren wurden Einkristalle von Sr9Zn4Cu2O14 dargestellt. Moderne Röntgenmethoden führen zu monokliner Symmetrie [Raumgruppe C2h3—C2/m; a = 22,22; b = 3,61; c = 11,29 Å; β = 98,6°, Z = 2]. Die Kristallstruktur enthält ein Sr/O-Gerüst mit Sr2+ in oktaedrischer und trigonal prismatischer Koordination. SrO6-Oktaeder treten partiell flächenverknüpft auf. In das Sr/O-Gerüst sind Zn2+-Ionen in Tetraederlücken und Cu+-Ionen mit hantelförmiger Koordination eingelagert.
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Compounds of the M3Ln10O18-Type (M = Ba + Ca; Ln = Sc + Yb, Ho + Y, La + Y). A Contribution about the Occupation of the Octahedra Network and Tunnel StructureThe compounds (I): BaCa2Sc5Yb5O18, (II): BaCa2Ho5Y5O18 and (III): BaCa2La5Y5O18 were prepared and investigated by single crystal X-ray technique. I-III crystallizes in the space group C66—P63, Z = 2. I: a = 17.138; c = 3.217 Å; II: a = 17.765; c = 3.377 Å; III: a = 18.000; c = 3.446 Å. The biggest tunnels of the [Ln9O18]6- network are occupied by Ba2+ the smaller one by Ca2+ and Ln3+ in statistical distribution. Ln3+ on the tunnel positions are I: Yb3+, II: Ho3+ and III: La3+. Considering the comparable radii of Ho3+ and Y3+ the f-orbitals of Ho3+ probable the reason of occupying the tunnel positions with rare earth elements.
    Notes: Die Oxide (I) BaCa2Sc5Yb5O18, (II) BaCa2Ho5Y5O18 und (III) BaCa2La5Y5O18 wurden einkristallin dargestellt und mit Röntgenmethoden untersucht. Sie kristallisieren in der Raumgruppe C66—P63 mit Z = 2. I: a = 17,138; c = 3,217 Å; II: a = 17,765; c = 3,377 Å; III: a = 18,000; c = 3,446 Å. Ba2+ besetzt die großen, Ca2+ mit Ln3+ die kleinen Tunnel des [Ln9O18]6--Oktaedergerüsts. Ln3+ auf Tunnelpositionen ist in I: Yb3+, in II: Ho3+ und in III: La3+. Bei Radiengleichheit von Ho3+ und Y3+ entscheiden vermutlich die f-Orbitale zugunsten der Tunnelbesetzung.
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