BARC/PUB/2015/0773

 
 

Determination of diffusion coefficients of hydrogen and deuterium in Zr-2.5%Nb pressure tube material using hot vacuum extraction-quadrupole mass spectrometry

 
     
 
Author(s)

Shrivastava, K. C.; Kulkarni, A. S.; Ramanjaneyulu, P. S.; Sunil, S.; Saxena, M. K.; Singh, R. N.; Tomar, B. S.; Ramakumar, K. L.
(RACD;MMD)

Source

Journal of Nuclear Materials, 2015. Vol. 461: pp. 151-156

ABSTRACT

The diffusion coefficients of hydrogen and deuterium in Zr–2.5%Nb alloy were measured in the temperature range 523 to 673 K, employing hot vacuum extraction-quadrupole mass spectrometry (HVE-QMS). One end of the Zr–2.5%Nb alloy specimens was charged electrolytically with the desired hydrogen isotope. After annealing at different temperatures for a predetermined time, the specimens were cut into thin slices, which were analyzed for their H2/D2 content using the HVE-QMS technique. The depth profile data were fitted into the equation representing the solution of Fick’s second law of diffusion. The activation energy of hydrogen/deuterium diffusion was obtained from the Arrhenius relation between the diffusion coefficient and temperature. The temperature dependent diffusion coefficient can be represented as DH = 1.41 x 10-7 exp(-36,000/RT) and DD = 6.16 x 10-8 exp(-35,262/RT) for hydrogen and deuterium, respectively.

 
 
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