Experimentelle Untersuchungen über die Diffusion von Helium in Steinsalzen und Sylvinen

Details Experimentelle Untersuchungen über die Diffusion von Helium in Steinsalzen und Sylvinen Experimentelle Untersuchungen über die Diffusion von Helium in Steinsalzen und Sylvinen

Dec 1954

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954gecoa...6..261g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 6, Issue 5-6, pp.261-267

Physics

2

Scientific paper

Measurements with a mass-spectrometer gave diffusion constants of helium in pure NaCl and in a sylvin mixture (45% NaCl and 55% KCl) in the temperature region between 500 and 650°C. An extrapolation of the measured values to the temperature region between 40 and 80°C showed good agreement with the values obtained from calculated corrections in age determinations. (Extrapolated values D He (80° C ) = 4.0 × 10 -17 cm 2 /sec; D He (40° C ) = 3.2 × 10 -19 cm 2 /sec; from age determinations D He (80° C ) = 1.2 × 10 -17 cm 2 /sec; D He (40° C ) = 1.2 × 10 -19 cm/sec.) A discussion is presented why these values differ from those derived by and . It was also shown that in sylvin, besides a pure volume diffusion, further processes of degassing occurred which were dependent upon the crystal structure.

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