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  • International Union of Crystallography (IUCr)  (126)
  • 2020-2024
  • 1995-1999
  • 1980-1984
  • 1965-1969  (126)
  • 1950-1954
  • 1969  (126)
Collection
Publisher
Years
  • 2020-2024
  • 1995-1999
  • 1980-1984
  • 1965-1969  (126)
  • 1950-1954
Year
  • 1
    Electronic Resource
    Electronic Resource
    Strain induced phase transformations in lead monoxide (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 2 (1969), S. 156-164 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The strain induced phase transformations produced in lead monoxide powders by ball milling at temperatures ranging from −196 to 200°C have been studied by X-ray diffraction methods. It has been found that either of the two polymorphs, litharge and massicot, was partially converted to the other at all the temperatures investigated, and that, whichever polymorph was the starting material, the end product, after a sufficiently long time, was a mixture of the two polymorphs, both highly strained. The percentage of each phase present was found to be dependent on the temperature of deformation. The results have been interpreted by consideration of the production of the microstrain energy required to overcome the energy barrier to the transformation, and of the shear generated in the mill on the pressure-temperature phase diagram. It is considered that shear stresses can affect the nature of the pressure-temperature phase diagram, in a manner theoretically postulated by Kumazawa. The commercial importance of the results has been briefly outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889869006856
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  • 2
    Electronic Resource
    Electronic Resource
    The crystal structure of tetra(pyridine oxide)copper(II) perchlorate (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 1378-1385 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740869004079
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  • 3
    Electronic Resource
    Electronic Resource
    The crystal structure of tetra(pyridine oxide)copper(II) fluoroborate (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 1595-1601 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740869004389
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  • 4
    Electronic Resource
    Electronic Resource
    Méthode directe de correction des profils de raies de diffraction des rayons X. I. Méthode numérique de déconvolution (1969)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 335-338 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A new method of correction of X-ray powder diffraction line profiles by deconvolution is being developed. The convolution equation, representing the phenomenon of deformation of a true diffraction line profile, is approached with the help of a quadrature formula by a system of linear equations. The bad conditioning of this system has led to the use of a stabilization method enabling one to obtain a result converging to the true solution which satisfies the physical phenomenon. The quadrature formulae which are used are described. This method has been programmed in Fortran II for the IBM 1620.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739469000544
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  • 5
    Electronic Resource
    Electronic Resource
    Méthode directe de correction des profils de raies de diffraction des rayons X. II. Influence de la fente réceptrice sur l'enregistrement d'un profil de raie de diffraction X (1969)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 338-350 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The numerical method of deconvolution described in part I is applied to a study of a broadening factor of the diffractometer: the receiving slit. By considering this factor the validity of this direct method of deconvolution, which can also be applied to analytical profiles and to experimental profiles, is verified. These results are compared with those obtained with the Stokes method for the Fourier analysis of line profiles and with those obtained with the Ergun method. An experimental study shows the importance of the divergence of parallelism between the receiving slit and the beam of X-rays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739469000556
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  • 6
    Electronic Resource
    Electronic Resource
    The crystal structure of arsenic at 4.2, 78 and 299°K (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 2 (1969), S. 30-36 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The lattice constants and the atomic position parameter, z, of a high purity, low strain, single-crystal of arsenic have been determined. Low extinction reflections of filtered Mo Kα and Ag Kα radiation were used for the determination of z. The Bond precision technique with Mo Kα radiation was used for the determination of the unit-cell dimensions a and c. Average values for a and c in Å, and for z are: 4.2°K z = 0.22764 a = 3.7597 c = 10.4412; 78°K z = 0.22754 a = 3.7595 c = 10.4573; 299±3°K z = 0.22707 a = 3.7598 c = 10.5475. The estimated standard deviation of z is ±0.00004 at 4.2°K, ±0.00002 at 78°K and ±0.00005 at 299°K. The precision of a is estimated to be ±0–0001 Å and that for c to be ±0.0002 Å. The results for As are compared with those reported earlier for Sb and Bi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889869006443
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  • 7
    Electronic Resource
    Electronic Resource
    Plastic deformation in tungsten carbide (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 2 (1969), S. 249-252 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The practical importance of tungsten monocarbide prompted an investigation into its wear mechanism. Initial studies on ball-milled tungsten carbide powders revealed considerable plastic deformation, coupled with a reduction in crystallite size. Deformation stacking faults, involving slip on the basal plane, were observed. The work was extended to sintered blocks, tool tips and single crystals. Studies on the worn surfaces of these revealed plastic deformation that extended to a depth of a few microns below the surface. The plastic deformation is an important factor in the wear of tungsten carbide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889869007151
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  • 8
    Electronic Resource
    Electronic Resource
    Tests of a Hankel transform method of determining electron densities of long cylinders from small-angle X-ray scattering data (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 2 (1969), S. 297-300 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The Hankel transform method proposed by Fedorov & Aleshin (1966; Vysokomol. Soed. 8, 1506; English translation, 1967: Polymer Science USSR 8, 1657) for calculating the electron density of long cylindrical particles with circular cross section is tested with theoretical intensity functions for which the density can be found both by an exact calculation and by numerical integration. (In this method, the density is assumed to depend only on the distance from the cylinder axis.) The tests show how the degree of resolution obtained in the density curve is related to the largest scattering angle at which data are available. For the step function density corresponding to a cylinder with uniform electron density, the requirements are more severe than for continuously decreasing density functions. The possibility of obtaining useful results with the available scattering data from two biological macromolecules is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889869007242
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  • 9
    Electronic Resource
    Electronic Resource
    The crystal structure of trimesic acid (benzene-1,3,5-tricarboxylic acid) (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 5-19 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740869001713
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  • 10
    Electronic Resource
    Electronic Resource
    The crystal and molecular structure of diaquobis-(2,2'-biimidazole)nickel(II) dinitrate, Ni(C6H6N4)2(H2O)2(NO3)2 (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 60-66 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740869001762
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