Premium
Positron annihilation studies on the interaction between hydrogen and defects in nickel
Author(s) -
Wu Y. C.,
Itoh Y.,
Ito Y.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221930204
Subject(s) - positron annihilation , hydrogen , tempering , materials science , vacancy defect , nickel , annihilation , doping , atomic physics , condensed matter physics , positron , metallurgy , nuclear physics , chemistry , physics , optoelectronics , organic chemistry , electron
Positron annihilation is measured for nickel containing defects carefully controlled by cold‐rolling, by further tempering, and by hydrogen doping. By the cold‐rolling the mean positron lifetime was increased from 123 to 179 ps corresponding to the formation of single vacancies and dislocations. The mean lifetime does not change significantly at further tempering. On hydrogen doping of the cold‐rolled sample a long lifetime component of about 390 ps appears, but a similar long lifetime component does not appear by hydrogen doping of the tempered sample. This suggests that hydrogen forms a composite with a vacancy which then becomes the center of vacancy agglomeration. The S‐parameter of the Doppler broadened annihilation radiation also shows changes completely in accordance with this interpretation.