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  • 1
    Digitale Medien
    Digitale Medien
    Relaxation dynamics in molecular alloys. II. Supercooled (C2F6)1−x (CClF3)x plastic crystals (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7397-7401 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Dielectric measurements on quenched (C2F6)1−x (CClF3)x fluorocarbon alloys are reported. In a wide concentration range, rapid cooling prevents these samples from unmixing and the plastic phase, characterized by translational order and orientational disorder, can be supercooled. The relaxation dynamics of crystals with x=0.32 is examined in detail. For temperatures below 50 K it exhibits a dominant primary and indications of secondary relaxation, i.e., typical features of glasses. The α-relaxation process is parametrized in terms of a modified Vogel–Fulcher law. Using this representation, (C2F6)0.68(CClF3)0.32 can be characterized as fragile glass according to Angell's classification scheme.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.460170
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  • 2
    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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  • 3
    Digitale Medien
    Digitale Medien
    Relaxation dynamics in molecular alloys. I. Annealed (C2F6)1−x(CClF3)x mixtures (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2143-2148 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Solid solutions of (C2F6)1−x(CClF3)x were investigated using dielectric spectroscopy. In part I of this work results on thermally equilibrated (C2F6)1−x(CClF3)x alloys are presented. The molar polarizability of liquid and plastic C2F6 was determined. The phase diagram of (C2F6)1−x(CClF3)x was studied in detail. It exhibits two eutectic points and a large miscibility gap. In a high-temperature orientationally disordered phase mixed crystals can be grown up to CClF3 concentrations x≈0.5; in the low-temperature ordered state solid solutions are stable for x≤0.25. The dielectric loss spectra indicate that in (C2F6)1−x(CClF3)x different relaxation channels are available for the CClF3 dipoles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.459885
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  • 4
    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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  • 5
    Digitale Medien
    Digitale Medien
    Submillimeter spectroscopy of tilted Nd1.85Ce0.15CuO4−δ films: Observation of a mixed ac-plane excitation (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 429-431 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The anisotropic conductivity of a series of tilted Nd1.85Ce0.15CuO4−δ thin films was measured by quasioptical spectroscopy in the frequency range 6 cm−1〈ν〈40 cm−1. Two characteristic features have been observed in the low-temperature transmission spectra. The first one at ν=12 cm−1 was shown to reflect the c-axis plasma frequency of Nd1.85Ce0.15CuO4−δ. The second feature represents a mixed ab-plane/c-axis excitation. The frequency of this resonance may be changed in a controllable way by rotating the polarization of the incident radiation. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.126999
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  • 6
    Digitale Medien
    Digitale Medien
    Charge transport in lithium phthalocyanine (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 5048-5053 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The ac electrical properties of monoclinic lithium phthalocyanine (LiPc) and of the iodinated compound LiPcI have been investigated in the frequency and temperature regimes 20 Hz≤ν≤1 GHz and 1.5 K≤T≤300 K, respectively. Both compounds are semiconductors with dielectric constants ε∞≈6 (LiPc) and 20 (LiPcI). Up to room temperature tunneling of charge carriers is the dominant conduction process in both compounds, yielding intrinsic dc conductivities σdc≈5.3×10−4 Ω−1 cm−1 (LiPc) and 0.2 Ω−1 cm−1 (LiPcI). The frequency and temperature dependence of the complex ac conductivity suggests polarons as the dominant species of charge carriers. The higher conductivity of the iodinated compound can be attributed to an enhanced mobility of the polaronic charge carriers which is most probably due to a better overlap of the π orbitals along the stacking direction of the molecules. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.471134
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  • 7
    Digitale Medien
    Digitale Medien
    Molecular reorientation in ortho-carborane studied by dielectric spectroscopy (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 4324-4329 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The dielectric properties of ortho-carborane have been investigated in a broad frequency range of 20 Hz≤ν≤1 GHz and at temperatures 10 K≤T≤380 K. At T(approximately-greater-than)275 K the ortho-carborane molecules undergo fast and isotropic reorientations with frequencies larger than 1 GHz. Below a phase transition at Tc≈275 K the reorientation is partly restricted and the dynamics of the remaining reorientational motion is reduced. At 160 K, the dielectric results reveal a small anomaly which we assign to a second phase transition. At temperatures 150 K〈T〈275 K the dipolar active orientational degrees of freedom freeze in on the time scale of the measuring frequencies. The corresponding peaks in the frequency dependence of the dielectric loss can well be described using the Fourier transform of the Kohlrausch–Williams–Watts (KWW) function with a stretching parameter β≈0.8. However, for frequencies well above the peak maximum we find significant deviations from KWW behavior. In the temperature and frequency range investigated, the dynamics of the dipolar relaxation process behaves thermally activated with an activation energy of 0.52 eV. In the classification scheme of Angell et al. the fragility of ortho-carborane can be estimated as m≈20 characterizing it as a strong glass former. Ortho-carborane fits well into the correlation scheme of Böhmer et al. where polydispersivity and fragility are related to each other. At high temperatures and low frequencies conductivity processes (hopping) dominate the dielectric response of ortho-carborane. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.471242
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  • 8
    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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  • 9
    Digitale Medien
    Digitale Medien
    Magnetic order in UCu"4"+"xAl"8"-"x
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 25-26 
    Details
    ISSN: 0304-8853
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)90686-I
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  • 10
    Digitale Medien
    Digitale Medien
    An inelastic neutron scattering study on the heavy fermion systems CeCu"2Ge"2 and CeAg"2Ge"2
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 63-64 (1987), S. 88-90 
    Details
    ISSN: 0304-8853
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(87)90531-2
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