ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Electron microscope study of an homologous series of shear structures based on molybdenum trioxide (1972)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 187-191 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Electron microscopy and diffraction evidence is presented for the existence of four new molybdenum oxides MonO3n−2, n = 19, 20, 21, and 22.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739472000403
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Electron-optical imaging of the hollandite structure at 3 Å resolution (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 672-676 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: This paper shows that it is possible markedly to improve the resolution obtainable in electron micrographs by deliberately using low beam divergence (2 × 10-4 rad) and by minimizing thermal spread in the electron gun. Point-to-point resolutions in the sub-3 Å range will be illustrated for the hollandite structure. Image matching, including the effects of both beam divergence and chromatic aberration, showed that the experimental images could be fitted using 2 Å objective aperture, with no divergence and defocus ripple of only 50 Å. In fact, these stringent experimental requirements must be met if useful structural information is to be obtained in the 2-3 Å range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739477001661
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Investigation of thin MoO3 crystals by convergent-beam electron diffraction (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 296-308 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The MoO3 structure is analysed by means of multi-slice calculations for crystals up to 80 Å thick. It is shown that for such thin crystals convergent-beam patterns can be simply analysed. This allows crystal thickness to be readily determined and opens up the way to more precise structure factor measurements. Many-beam calculations are also used to analyse unit-cell and symmetry data obtained by convergent-beam diffraction/microscopy observations of '101' domains in molybdenum trioxide, showing that [MoO6] octahedra in domains are more nearly regular than in MoO3. This is supported by analysis of thermal diffuse scattering. The '101' domain structure has space group Cmcm and unit-cell parameters identical to those of the molybdenum oxide-hydroxide Mo4O10(OH)2. A qualitative comparison of calculated and observed intensities for the space-group-forbidden 100 reflexions of MoO3 indicates the presence of epitaxically deposited surface layers. This observation, together with the evidence of a hydroxylated domain structure, suggests that thin crystals are formed with epitaxic hydroxyl layers which diffuse into the bulk structure when the crystals are heated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478000558
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Interpretation of dynamical diffuse scattering of fast electrons in rutile (1985)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 320-327 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An Einstein model for thermal diffuse scattering is extended to a fully dynamical n-beam Bloch-wave treatment, where explicit account is taken of the scattering site symmetry from individual atoms. Dynamical effects in this model are related to orientation-dependent fluctuations in current density on localized scattering centres within the crystal, yielding excess or deficit Kikuchi bands. Calculated diffuse scattering distributions are compared with experimental observations from rutile (TiO2). The predicted diffuse distribution for scattering from oxygen sites correlates reasonably well with experiment, implying a relatively weak contribution for (localized) thermal diffuse scattering of fast electrons from titanium sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767385000708
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Intersecting defect structures in gallia-and magnesia-doped rutiles (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 449-458 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The possible { 210 } (0½0) defect intersection structures of rutile are analysed. There are 41 distinct intersection classes, 26 of which may exist as enantiomorphic forms. A classification scheme is introduced and used to analyse 386 observed intersections. Examples of 25 classes occur; eight of these account for 87% of the observations. The occurrence frequency may be understood by analysis of the stair-rod dislocation Burger's vector, required for continuity of the rutile structure around the intersection. Structural models for the commonly observed intersections and the nature of the 'dislocation-core' structures are presented. Exceptionally large tunnels are generated at orthogonal intersections and some high-resolution images are discussed. Statistical analysis shows that the distribution over the possible classes is not random, suggesting that an equilibrium network of intersecting defects may arise after long reaction times. The stability and mobility of intersections is expected to determine the kinetics of the reaction between rutile and dopants. Intersection structures may act as nuclei for low- to high-temperature phase transformations and they may aggregate and order to form new ordered structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739479001066
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    On the relation between molybdenum trioxide and rhenium trioxide type crystal structures (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 28-30 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structural relatiion between MoO3-type and ReO3-type is clarified by considering layers of anions parallel to (13{\bar 1})MoO3 and (111)ReO3. MoO3 is then seen to be approximately cubic close-packed anions while ReO3 is cubic close-packed anions but with one-quarter of the anion sites unoccupied. The two structures may then be interconverted by a rotation operation resembling that which links ReO3- and PdF3-type structures. Photographs of ball models are used to illustrate the relations. No compounds are known which exhibit direct transition from ReO3-type to either MoO3- or PdF3-type. This is probably because of the large change in volume per anion. The interface between ReO3 and the close packed structures may be described as a dilation fault.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000069
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Continuous structure variation and rotating reciprocal lattices in the titanium–chromium oxides (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 265-272 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: High-index, rutile-derived, crystallographic shear (CS) structures occupy the composition range (Ti, Cr)Ox, 1.875 ≤ x ≤ 1.93. The CS plane rotates continuously from (121), to (132), about the [1{\bar 1}1]r zone axis, producing a continuous series of intermediate CS planes with (hkl)r = p. (121)r + q. (011)r. In the reciprocal lattice a fine net of superstructure reflexions rotates continuously relative to a coarse net of rutile subcell reflexions. Analogous reciprocal-lattice behaviour should be a general crystallographic phenomena and may appear in any system where superstructures occur. It is shown how the intermediate diffraction patterns may be indexed by deriving a single transformation matrix relating the unit cells of the high-index superstructures to that of the basic subcell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474000544
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Diamond nanocrystals formed by direct implantation of fused silica with carbon (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 3007-3018 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report synthesis of diamond nanocrystals directly from carbon atoms embedded into fused silica by ion implantation followed by thermal annealing. The production of the diamond nanocrystals and other carbon phases is investigated as a function of ion dose, annealing time, and annealing environment. We observe that the diamond nanocrystals are formed only when the samples are annealed in forming gas (4% H in Ar). Transmission electron microscopy studies show that the nanocrystals range in size from 5 to 40 nm, depending on dose, and are embedded at a depth of only 140 nm below the implanted surface, whereas the original implantation depth was 1450 nm. The bonding in these nanocrystals depends strongly on cluster size, with the smaller clusters predominantly aggregating into cubic diamond structure. The larger clusters, on the other hand, consist of other forms of carbon such as i-carbon and n-diamond and tend to be more defective. This leads to a model for the formation of these clusters which is based on the size dependent stability of the hydrogen-terminated diamond phase compared to other forms of carbon. Additional studies using visible and ultraviolet Raman Spectroscopy, optical absorption, and electron energy loss spectroscopy reveal that most samples contain a mixture of sp2 and sp3 hybridized carbon phases. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388857
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    High-resolution electron microscopy of microcrystalline partially crystalline and amorphous silicates (1981)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 85 (1981), S. 3007-3010 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150620a032
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    New light on the crystal structure of zeolite A (1981)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 85 (1981), S. 2409-2421 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150616a023
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...