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A positron trapping study of non-equilibrium defects created by the hcp ∌ fcc phase change in cobalt |
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| Authors: | C.W. Schulte J.L. Campbell K.W.D. Ledingham P.C. Lichtenberger |
| Affiliation: | Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1;Kelvin Laboratory, University of Glasgow, East Kilbride, U.K.;Department of Engineering Physics and Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1 |
| Abstract: | Measurements of annihilation lineshape parameter S show that the hcp ? fcc phase change in cobalt creates a non-equilibrium defect population capable of trapping positrons. These defects can be removed by annealing above 870 K. This effect explains the discontinuous behaviour of S(T) at 690 K, which had been attributed to a lattice-structure dependence of free positron annihilation. |
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