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  • 1
    Electronic Resource
    Electronic Resource
    Structures of nanometre-size crystals determined from selected-area electron diffraction data (2000)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 29-35 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of a new modification of Ti2Se, the β-phase, and several related inorganic crystal structures containing elements with atomic numbers between 16 and 40 have been solved by quasi-automatic direct methods from single-crystal electron diffraction patterns of nanometre-size crystals, using the kinematical aproximation. The crystals were several thousand times smaller than the minimum size required for single-crystal X-ray diffraction. Atomic coordinates were found with an average accuracy of 0.2 Å or better. Experimental data were obtained by standardized techniques for recording and quantifying electron diffraction patterns. The SIR97 program for solving crystal structures from three-dimensional X-ray diffraction data by direct methods was modified to work also with two-dimensional electron diffraction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767399009605
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  • 2
    Electronic Resource
    Electronic Resource
    Electron crystallography without limits? Crystal structure of Ti45Se16 redetermined by electron diffraction structure analysis (2001)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 183-191 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystal structure of the metal-rich compound Ti45Se16 was redetermined from selected-area electron diffraction film data. The structure was solved by quasi-automatic direct methods using a data set of quantified h0l electron diffraction intensities. Improved atomic coordinates were obtained from a subsequent least-squares refinement on the basis of the kinematical approximation. The compound crystallizes in the monoclinic space group C2/m with lattice parameters a = 36.534, b = 3.453, c = 16.984 Å, β = 91.73°. The structure contains 23 titanium and 8 selenium atoms per asymmetric part of the unit cell. The refined atomic coordinates agree on average within 0.18 Å with the previously determined structure from high-resolution electron-microscopy images. The precision of the determined atomic coordinates obtained in this study is better than 0.05 Å. The structure of Ti45Se16 is the eighth metal-rich structure that has been solved by direct methods from two-dimensional selected-area electron diffraction data using the quasi-kinematical approximation. The present investigation proves again that direct methods with electron diffraction data work extremely reliably provided that the structure in question is composed of elements of nearly equal scattering power and that data covering the most significant parts of the unit-cell transform up to atomic resolution are available. Moreover, a method was developed that allows the estimation of the average crystal thickness from the effective atomic potential in the refined structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767300014070
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  • 3
    Electronic Resource
    Electronic Resource
    A crystal structure determined with 0.02 Å accuracy by electron microscopy (1996)
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 144-146 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Metal-rich compounds frequently contain clusters with metal-metal (M-M) bonded octahedral M6 cores. Depending on the relative metal content, these octahedral units may condense, that is, share corners, edges or faces. The condensed M6 clusters can be regarded as slightly distorted fragments of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/382144a0
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  • 4
    Electronic Resource
    Electronic Resource
    Ti9Se2 - Eine Verbindung mit kolumnaren ∞1[Ti9]-BaueinheitenProfessor Herbert Jacobs zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 630-634 
    Details
    ISSN: 0044-2313
    Keywords: Metal-rich titanium selenide ; preparation ; single crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Metal-Rich Titanium Selenide Ti9Se2The new compound Ti9Se2 has been prepared as hitherto most metal-rich phase in the system titanium-selenium. It crystallizes in the orthorhombic space group Pbam (No. 55) with a = 691.7(2), b = 1 550.5(9), c = 345.4(2) pm. The structure consists of ∞1[Ti9]-strings which are described within the concept of condensed clusters. The Se atoms are coordinated by tricapped trigonal prisms of Ti atoms.
    Notes: Die erstmals dargestellte Verbindung Ti9Se2 ist die bislang metallreichste Phase im binären System Titan-Selen. Sie kristallisiert in der orthorhombischen Raumgruppe Pbam (Nr. 55) mit a = 691.7(2), b = 1 550.5(9), c = 345.4(2) pm. Die Struktur enthält ∞1[Ti9]-Baueinheiten, die im Konzept kondensierter Metallcluster beschrieben werden. Die Se-Atome sind von einem dreifach überkappten trigonalen Prisma aus Ti-Atomen umgeben.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220410
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