Stacking fault defects in hep cobalt studied by PAC |
| |
Authors: | Gregeory McGhee Gary S Collins |
| |
Institution: | (1) Department of Physics, Washington State University, 99164-2814 Pullman, Washington, USA |
| |
Abstract: | A study was made of lattice defects in hep Co metal using the technique of perturbed γ-γ angular correlations. Lattice sites
of111Cd impurities were characterized by their nuclear magnetic dipole and electric quadrupole interaction frequencies, respectively
ωL and ωO. The signal for defect-free substitutional Cd impurities was found to have collinear interactions at 77K, with ωL=438 Mrad/s and ωO=7 Mrad/s. Analysis of measurements after heavy deformation at 100 K and after annealings up to 700 K gave little evidence
of thermal trapping of point defects. However, in all spectral measured after deformation, a highly stable defect site with
ωL=418 and ωO Mrad/s, and showing collinear interactions, was also observed. It is attributed to a111Cd probe in a stacking fault (SF). Assuming a random distribution of proble atoms and SF's, a SF density of 20% was estimated. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|