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Il Nuovo Cimento (1955-1965)

, Volume 13, Issue 1, pp 148–153 | Cite as

The diffusion coefficient in dilute H2-D2 and3He-4He liquid mixtures

  • G. Careri
  • J. Reuss
  • J. M. Beenakker
Article

Summary

An apparatus has been built to measure the diffusion coefficient in liquids at very low temperatures. This technique has been applied to the hydrogen-deuterium dilute mixtures, and the results can be expressed by an Arrhenius type equation as function of the absolute temperatureD=64 exp [48/T]·10−5 cm2/s. The same technique was more difficult to use for the helium isotope mixtures. The results are affected by large errors and roughlyD=(4±2)·10−5 cm2/s in the temperature range above theλ point.

Riassunto

È stato costruito un apparecchio per misurare il coefficiente di diffusione in liquidi a bassissime temperature. Questa tecnica è stata applicata a miscele diluite idrogenodeuterio ed i risultati possono essere espressi da una equazione del tipo Arrhenius in funzioni della temperaturaD=64 exp [48/T]·10−5 cm2/s. Si sono incontrate maggiori difficoltà nell’usare la stessa tecnica con miscele di isotopi d’elio. I risultati sono affetti da grossi errori e approssimativamenteD=(4±2)·10−5 cm2/s per temperature superiori al puntoλ.

References

  1. (&s**).
    This technique has been very briefly outlined by us a few years ago (1), and in the meantime following our procedure, this apparatus has been used at liquid air temperature by other workers (2).Google Scholar
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    G. Careri, J. M. Beenakker andK. W. Taconis:Communication on Congrès de la Physique des Basses Températures (Paris, 1955), p. 393.Google Scholar
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    G. Cini-Castagnoli, G. Pizzella andF. P. Ricci:Nuovo Cimento,10, 309 (1958).CrossRefMATHGoogle Scholar
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    J. S. Anderson andK. Saddington:Journ. Chem. Soc.,8, 381 (1949).CrossRefGoogle Scholar
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    R. L. Garwin andH. A. Reich:Kamerling Onnes Conference on Low Temperature Physics, Physica (Sept. 1958), p. 133.Google Scholar
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    J. M. Beenakker andK. W. Taconis:Progress in Low Temperature Physics, vol.1 (Amsterdam, 1955), p. 131.Google Scholar
  7. (6).
    G. Careri, J. Reuss, F. Scaramuzzi andJ. O. Thomson:Proc. Int. Conference Low Temperature Physics and Chemistry (Madison, 1957), p. 155.Google Scholar

Copyright information

© Società Italiana di Fisica 1959

Authors and Affiliations

  • G. Careri
    • 1
    • 2
  • J. Reuss
    • 1
    • 2
  • J. M. Beenakker
    • 1
    • 2
  1. 1.Laboratori Nazionali dell’I.N.F.N.Frascati
  2. 2.Kamerling Onnes LaboratoriumLeiden

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