Li7 self diffusion in LiAl—An NMR study |
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| Authors: | JR Willhite N Karnezos P Cristea JO Brittain |
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| Institution: | Materials Research Center, Northwestern University, Evanston, IL 60201, U.S.A. |
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| Abstract: | The self diffusion of Li7 in near stoichiometric LiAl has been investigated by observing the Li7 and Al27 NMR relaxation rates. The diffusivity for a Li7 atom is determined to be D = 9 × 10?6 exp (?0.12 eV/kT) cm2/sec. Both the Li7 and Al27 rates show the effects of quadrupole relaxation. The electric field gradients from the moving defects in LiAl are a factor of 37 ± 5 stronger at the Al nuclei suggesting covalent character to the bonding. |
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