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  • 1
    Digitale Medien
    Digitale Medien
    A modified dual-slope method for heat capacity measurements of condensable gases (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3841-3845 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A high resolution nonadiabatic method for measuring the heat capacity (CP) of bulk samples of condensable gases in the range of 7.5–70 K is described. In this method CP is evaluated by directly comparing the heating and cooling rates of the sample temperature for two algebraically independent heat pulse sequences without explicit use of the thermal conductance between sample and thermal bath. A fully automated calorimeter for rapid measurement of CP of molecular solids utilizing this technique is presented. The technique along with the automated calorimeter with a provision to apply external electric and magnetic fields is particularly useful for the study of continuous phase transitions in molecular solids as well as field induced changes in the heat capacity. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1290040
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  • 2
    Digitale Medien
    Digitale Medien
    Very high sensitivity ac capacitance bridge for the dielectric study of molecular solids at low temperatures (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4055-4058 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An ac capacitance bridge with excellent stability and two parts per billion resolution in the real part of the dielectric constant at temperatures ranging from 4.2 to 80 K and in the audio frequency range (0.2–20 kHz) is reported. The method uses commercially available components as well as few homemade cables and capacitors. Construction details and data on the resolution are presented. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150035
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  • 3
    Digitale Medien
    Digitale Medien
    NMR studies of the orientational ordering in dilute solid N2-Ar mixtures (1996)
    Springer
    Journal of low temperature physics 103 (1996), S. 49-70 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report the results of NMR studies of the orientational ordering of15N2 molecules in solid N2-Ar mixtures for N2 concentrations in the 40–50% range. For samples with 50%15N2 a new phase distinct from the quadrupolar glass phase for the hcp structure has been observed. In this new phase, the local orientational order parameters were found to have very closely the same value at each site in contrast to the very broad distribution of order parameters observed in the quadrupolar glass state for the hcp lattice at higher concentrations (57–77%).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00754657
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  • 4
    Digitale Medien
    Digitale Medien
    The Orientational Ordering in Dilute Solid N2–Ar Mixtures (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 365-370 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract NMR studies have been carried out to determine the nature of the orientational ordering of N 2 in dilute solid N 2–Ar mixtures. The orientational ordering for cubic lattices (x(N 2)≍50%) was compared to that observed for the hexagonal lattice structures for 57 〈 x(N 2) 〈 75%. The NMR line shapes for the cubic structures were found to be sharply defined and could only be explained in terms of a narrow distribution of order parameters. This is in contrast to the quadrupolar glass state with a very broad order parameter distribution observed for the hexagonal structures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022287720183
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