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  • 1
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Optimization of the conditions of electron probe microanalysis enables a quantitative determination of boron and carbon in compounds of the system Y-Ni-B-C. With this method boron deficiencies in YNi2B2C and solid solutions of carbon in Ni2B and YNiB4 were found. The number of boron deficiencies correlates with the Tc values of the superconducting transition in YNi2B2C.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Copper, rare earth, tungsten, oxide ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Chemistry of Copper Rare-Earth Oxotungstates: (I): triclinic-α-CuTbW2O8, (II): monoclinic-CuInW2O8 and (III): monoclinic-CuYW2O8Single crystals of (I), (II) and (III) were prepared by recrystallisation in closed systems and examined by X-ray technique. (I): space group Cil—P1, a = 7.3080, b = 7.8945, c = 7.1476 Å, α = 115.23, β = 116.21, γ = 56.98°, Z = 2; (II): space group C2h6—C2/c, a = 9.6576, b = 11.6496, c = 4.9863 Å, β = 91.17°, Z = 4; (III): space group C2h4—P2/n, a = 10.0504, b = 5.8214, c = 5.0224 Å, β = 94.23°, Z = 2. The crystal structures are discussed with respect to calculations of the coulombterms of lattice energy and possible valence states of Cu2+ and Mo5+.
    Notes: Einkristalle von (I), (II) und (III) wurden durch Rekristallisation in geschlossenen Systemen dargestellt und röntgenographisch untersucht. Die kristallographischen Daten lauten: (I): Raumgruppe Cil—P1, a = 7,3080, b = 7,8945, c = 7,1476 Å, α = 115,23, β = 116,21, γ = 56,98°, Z = 2; (II): Raumgruppe C2h6—C2/c, a = 9,6576, b = 11,6496, c = 4,9863 Å, β = 91,17°, Z = 4; (III): Raumgruppe C2h4—P2/n, a = 10,0504, b = 5,8214, c = 5,0224 Å, β = 94,23°, Z = 2. Die Kristallstrukturen werden mit Blick auf Berechnungen der Coulombterme der Gitterenergie und mögliche Ladungen von Cu2+ und Mo5+ diskutiert.
    Additional Material: 3 Ill.
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  • 3
    ISSN: 0044-2313
    Keywords: Copper ; lead ; oxide ; preparation ; structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of the First Ternary Lead(II) Copper(I) Oxide: PbCu2O2PbCu2O2 can be prepared by solid state reaction or by precipitation from a basic aqueous solution. Single crystals of the new compound were prepared by recrystallisation from a molten mixture (PbO—Cu2O) and investigated by X-ray diffractometer technique. PbCu2O2 crystallizes isotypically with the homologue silver compound PbAg2O2 (monoclinic with a = 8.223 Å, b = 8.289 Å, c = 6.015 Å, β = 132.62°, Z = 4, space group C2h6—C 1 2/c 1). The crystallographic data from the X-ray investigation are reported. The structure is built by endless ∞1[PbO4/4]- and ∞1[CuO2/4]-chains. Pb2+ has a one-sided asymmetric coordination with four next oxygen neighbours and Cu+ forms a stretched dumbbell with two oxygen atoms.
    Notes: PbCu2O2 kann durch Feststoffreaktion oder aus alkalischer, wässeriger Lösung erhalten werden. Einkristalle der neuen Verbindung wurden aus einer erstarrten Oxidschmelze (PbO—Cu2O) präpariert und mit Vierkreisdiffraktometertechnik röntgenographisch untersucht. PbCu2O2 ist isotyp mit der homologen Silberverbindung PbAg2O2 (monoklin mit a = 8,223 Å, b = 8,289 Å, c = 6,015 Å, β = 132,62°, Z = 4; Raumgruppe C2h6—C 1 2/c 1). Die kristallographischen Daten der Röntgenstrukturanalyse werden mitgeteilt. Die Kristallstruktur ist durch ∞1[PbO4/4]- und ∞1[CuO2/4]-Ketten charakterisiert. Pb2+ hat eine einseitige Koordination mit vier nächsten Sauerstoffnachbarn. Cu+ bildet mit zwei Sauerstoffatomen eine gestreckte Hantel.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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