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  • 1
    Digitale Medien
    Digitale Medien
    The effect of phase separation on short- and intermediate-range order in high-silica Li2O–SiO2 glasses (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 9647-9652 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Wide-angle neutron diffraction measurements have been performed on single-phase and phase-separated high-silica glasses in the system Li2O–SiO2. The structure factors of the single-phase glasses vary modestly with increasing Li2O concentration compared to the changes observed when Na2O or K2O is added to SiO2, and vestiges of the intermediate-range order characteristic of v-SiO2 are retained to 33 mol % Li2O. The structure factors of single-phase and phase-separated glasses are identical to within 1%–2%, indicating that phase separation results in very minor disruptions to local atomic arrangements. When combined with evidence obtained from previous studies, these data indicate that single-phase high-silica glasses in this system contain compositional heterogeneities analogous to those produced by phase separation. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.468783
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  • 2
    Digitale Medien
    Digitale Medien
    Structure of Two Disordered Molybdates, Li2MoIVO3 and Li4Mo3IVO8, from Total Neutron Scattering (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 604-612 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The structures of the disordered lithium molybdates Li2MoO3 and Li4Mo3O8 have been investigated using total neutron scattering from polycrystalline powders. Rietveld analysis of the Bragg scattering is used to determine the average structures. Shortcomings in this method of analysis are demonstrated by comparing the total correlation function, T(r), determined from total neutron scattering, with those calculated from the structures determined from Rietveld analysis. Much more satisfactory models for these materials are derived from the structurally related ordered material LiZn2Mo3O8, using information from Mo K-edge extended X-ray absorption fine-structure spectroscopy (EXAFS). These models include metal–metal-bonded Mo3O13 clusters [d(Mo—Mo) = 2.58 Å in Li2MoO3 and 2.56 Å in Li4Mo3O8] not present in the average structure determined from Rietveld analysis [d(Mo—Mo) = 2.88 Å in Li2MoO3]. In contrast to EXAFS studies neutron diffraction yields information on all the pair correlations in the material, not merely those involving molybdenum, and allows, for example, the location of lithium. Remaining discrepancies between our models and the experimental T(r)'s give an insight into the disorder in the two materials.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108768197003844
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  • 3
    Digitale Medien
    Digitale Medien
    Local structural instability of high-T c oxide superconductors studied by inelastic neutron scattering (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 415-418 
    Details
    ISSN: 1572-9605
    Schlagwort(e): Oxide superconductors ; structural instability ; neutron scattering
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The scattering function,S(Q, E), of superconducting La1.85Sr0.15CuO4 and YBa2Cu3O7 was measured over a wide range ofQ-E space by inelastic neutron scattering. Fine structures in their phonon density of states as well as theQ-dependences ofS(Q, E) were observed. TheQ-dependence ofS(Q, E) is very susceptive atT c , with an anomalous behavior similar to a critical phenomenon. We have found that the anomalous behavior is related to the local structural instability, i.e., the 〈110〉 buckling motion of the Cu-O plane and the shortening of the distance between the apical oxygen and the copper atom in the plane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00724579
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  • 4
    Digitale Medien
    Digitale Medien
    Dynamical structural instability in YBa2Cu3O6.6 (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 837-842 
    Details
    ISSN: 1573-7357
    Schlagwort(e): 74.72−h ; 74.72.Bk ; 87.64.Bx ; 74.25.Kc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have performed inelastic neutron scattering and total neutron scattering experiments on the under-doped superconductor YBa2Cu3O6.6. We have found that the dynamical structure and the local structure concerned about the CuO2 plane has an anomalous temperature dependence at Tc (=57K) and well above Tc (TSG∼150K), which may be explained by a spin-gap opening.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00768487
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