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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1369-1373 
    ISSN: 0044-2313
    Keywords: Ternary niobium oxides ; synthesis ; crystal structure ; X-ray absorption near-edge structure (XANES) studies ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung, Struktur und Röntgenabsorptionsspektren von LixNbO2 und NaxNbO2 (x ≤ 1)Zwei Serien von Verbindungen, LixNbO2 und NaxNbO2, wurden durch Oxidation von LiNbO2 und NaNbO2 dargestellt. Die Auswertung von Neutronenbeugungsexperimenten ergibt eine vollbesetzte Lithium-Lage für x = 1. Auch wenn sich die Kristallsymmetrie für x 〈 1 nicht ändert, wie durch Guinier-Aufnahmen gezeigt wird, zeigen die Spektren der Nb—LIII-Kanten doch signifikante Änderungen, die auf eine abnehmende Besetzung der Nb-d-Zustandsdichte hinweisen.
    Notes: The two series of compounds, LixNbO2 and NaxNbO2, were synthesized from LiNbO2 and NaNbO2 with oxidizing agents. From neutron diffraction, it is concluded that the Li position is fully occupied for x = 1. Even though the long-range crystal symmetry does not seem to change for x 〈 1, as monitored by Guinier X-ray powder patterns, the Nb—LIII XANES spectra exhibit significant spectral variations with x which reflect changes in the unoccupied d-density of states.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chlorides ; lanthanides ; synthesis ; crystal structure ; X-ray absorption spectroscopy ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Chlorides Na3xM2-xCl6 (M = La—Sm) and NaM2Cl6 (M = Nd, Sm): Derivatives of the UCl3-Type of Structure. Synthesis, Crystal Structure and X-Ray Absorption Spectroscopy (XANES)Single crystals of the derivatives of the UCl3-type structure Na3xM2-xCl6 (M = La/x = 0.364(4); Ce/0.349(5); Pr/0.318(8); Nd/0.305(5); Sm/0.246(4)) and NaSm2Cl6 were grown by different methods generally under reducing conditions. They are addition [Na(Sm2)Cl6] and addition/substitution variants [Na2x(NaxM2-x)Cl6] of the UCl3 structure type [□(U2)Cl6]. X-Ray Absorption Spectroscopy (XANES) at the LIII edge characterizes NaSm2Cl6 and NaNd2Cl6 as mixed-valence compounds with valences of +2 and +3 in statistical distribution (approximately 1:1) for Sm and Nd, respectively.
    Notes: Einkristalle der Derivate des UCl3-Typs Na3xM2-xCl6 (M = La/x = 0,364(4); Ce/0,349(5); Pr/0,318(8); Nd/0,305(5); Sm/0,246(4)) sowie von NaSm2Cl6 wurden auf unterschiedlichen Wegen, im allgemeinen unter reduzierenden Bedingungen erhalten. Sie sind Additions- [Na(Sm2)Cl6] bzw. Additions- / Substitutionsvarianten [Na2x(NaxM2-x)Cl6] des UCl3-Strukturtyps [□(U2)Cl6]. Röntgenabsorptionsspektren (XANES) an der Lm-Kante charakterisieren NaSm2Cl6 und NaNd2Cl6 als gemischtvalente Verbindungen mit Valenzen von +2 und +3 in statistischer Verteilung (etwa 1:1) für Sm bzw. Nd.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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