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  • 1985-1989  (7)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Dielectric properties of condensed fluoromethanes and fluoromethane mixtures (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4981-4986 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Dielectric measurements were performed on liquid and solid (CF4)1−x (CMF3)x with M=H, Cl, and Br. The dielectric behavior of the polar molecules in the liquid state is well described by an Onsager equation. At the melting point, pure hydrogenated and brominated fluoromethanes condense into dipolar rigid phases, while pure tetrafluoromethane forms a plastic crystal. CClF3 exhibits dipolar relaxational phenomena in the solid state. The data indicate that near the melting point this compound is close to a transition into a plastic phase. Mixtures of CF4 with CHF3 and CBrF3 exhibit monotectic phase diagrams with a limited solubility in the liquid state and complete immiscibility in the solid state. However, formation of mixed crystals is found in (CF4)1−x (CClF3)x which exhibits a eutectic phase diagram.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455641
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  • 2
    Digitale Medien
    Digitale Medien
    Radio-frequency dielectric measurements at temperatures from 10 to 450 K (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 901-904 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A coaxial air line was constructed to connect a radio-frequency impedance analyzer and a temperature-stabilized sample holder. It is suitable for dielectric measurements in the frequency range 1 MHz–1 GHz and at temperatures between 10 and 450 K. The dielectric dispersion of Fe-doped BaTiO3 and Na-doped KCN is presented. The results demonstrate the capability of this setup when investigating materials with high as well as with low dielectric constants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.342990
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  • 3
    Digitale Medien
    Digitale Medien
    Orientational Glasses (1989)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 40 (1989), S. 29-60 
    Details
    ISSN: 0066-426X
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.pc.40.100189.000333
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  • 4
    Digitale Medien
    Digitale Medien
    Mass spectra of heavy ions near comet Halley (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 335-336 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Spectral observations of comets from the ground as well as from Earth-orbiting satellites have revealed a variety of neutral and ionic species. However, reliable cometocentric radial profiles of the number densities of individual species, which are required for comparison with atmospheric/ ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/321335a0
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  • 5
    Digitale Medien
    Digitale Medien
    Magnetic order in a Kondo lattice: A neutron scattering study of CeCu2Ge2 (1989)
    Springer
    The European physical journal 77 (1989), S. 95-104 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Elastic and inelastic neutron scattering studies of the Kondo lattice CeCu2Ge2 were performed. AtT N=4.1 K an incommensurate magnetic order develops with an ordering wave vectorq 0=(0.28, 0.28, 0.54) and an ordered moment µ s =0.74 µB. The crystalline electric field splits the 4f 1-J-multiplet of the Ce ion into a ground state doublet and a quartet at 191 K. The wave function of the ground state yields an ordered moment of 1.54µB. Thus, due to the onset of the formation of a Kondo singlet the magnetic moment is considerably reduced. The magnetic relaxation rate Λ was investigated via quasielastic neutron scattering. The temperature dependence of Λ(T) is characteristic of heavy-fermion systems with a high temperature square root dependence and a limiting low temperature value, yielding a Kondo temperatureT K≈10K. The quasielastic component of the scattered neutron intensities persists down to the lowest temperatures, well belowT N. This quasielastic line is regarded as a characteristic feature of heavy-fermion systems and corresponds to the enhanced value of the linear term of the specific heat.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01313625
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  • 6
    Digitale Medien
    Digitale Medien
    Phases and phase transitions of (NaCl)1−x(NaCN)x (1985)
    Springer
    The European physical journal 61 (1985), S. 209-215 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract (NaCl)1−x(NaCN)x mixed crystals with CN-concentrationsx of 0.87, 0.76, 0.71 and 0.65 have been investigated by X-ray powder diffraction. Apart from the cubic room temperature phase, a rhombohedral and an orthorhombic phase have been identified. In addition a glass state has been observed which is characterized by a strong broadening of the cubic powder lines. The phase diagram shows a wide coexistence gap between the non-cubic phases and the glass state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01307778
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  • 7
    Digitale Medien
    Digitale Medien
    Elastic and quasielastic neutron scattering studies in KBr:KCN mixed crystals (1989)
    Springer
    The European physical journal 75 (1989), S. 81-99 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Neutron scattering studies in (KBr)1−x(KCN)x mixed crystals are presented utilizing powder diffraction, single crystal diffraction and time-of-flight techniques. Forx〉0.6 (KBr)1−x(KCN)x crystals exhibit ferroelastic and ferroelectric low-temperature phases. Crystals withx〈0.6 undergo transitions into an orientational glass state. Here we present a detailed phase diagram including new results for x=0.85 and x=0.65. For the latter system a stable rhombohedral low-temperature phase has been detected where the orientational disorder of the plastic phase is only partly removed and quadrupolar relaxations between three body diagonals are still possible. From the powder diffraction experiments we determined further the concentration dependence of the static Debye-Waller factors which can be explained by an interplay of the rotation-translation and the rotation-random strain coupling. With single crystal diffraction techniques we studied the diffuse scattered intensities which are directly related to the order parameter of the glass state. The temperature dependence of the quasielastic intensities near the critical concentration shows a strong increase forT〈110K indicative for a freezing-in of shear fluctuations which is a characteristic feature of a non-ergodic instability. This phenomenon appears for ordering (x=0.65) and for non-ordering, glassy compounds. A further anomaly in (KBr)0.43(KCN)0.57 at 75 K is interpreted in terms of a residual elastic ordering process. With high-resolution time-of-flight techniques we analysed the dynamic structure factor for x=0.57. We demonstrate that the central peak consists of a static and a dynamic component. The results are compared with mode coupling theories which describe the glass transition in supercooled liquids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01313571
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