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- W2133784247 abstract "Spin-lattice relaxation time (T1), isotropic Knight shift (Kiso) and quadrupole coupling constant (CQ) have been measured in technetium metal by pulsed 99Tc NMR in a magnetic field of 7.04 T in the temperature range 120-400 K. It was found that (T1×T)-1 = 3.21±0.35 (s K)-1, Kiso(T) = 7305-1.52T ppm; the quadrupole coupling constant CQ = 5.74±0.05 MHz is temperature independent. Experimental data on T1 and Kiso are analysed in terms of the contact, d-polarization and orbital hyperfine interactions. It is shown that the main contribution to the relaxation rate comes from the contact interaction and the Knight shift is governed by the orbital interaction. The electric field gradient at the 99Tc nucleus site is considered to be a sum of the electron qel and lattice qlat contributions with different signs. The calculated lattice contribution is positive and constitutes about 30% of the electronic contribution. The obtained values of qel and qlat are compared with data for other metals with hexagonal close-packed lattices." @default.
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- W2133784247 date "2001-11-16" @default.
- W2133784247 modified "2023-09-26" @default.
- W2133784247 title "Knight shift, spin-lattice relaxation and electric field gradient in technetium metal" @default.
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- W2133784247 doi "https://doi.org/10.1088/0953-8984/13/48/328" @default.
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