This document summarizes a study that measured spin-lattice relaxation time (T1), Knight shift (Kiso), and quadrupole coupling constant (Cq) in technetium metal using pulsed 93Tc NMR at temperatures from 120-400K and a magnetic field of 7.04T. It found that (T1T)-1 = 3.21±0.35 s-1K-1, Kiso(T) = 7305-1.52T ppm, and Cq = 5.74±0.05 MHz and is temperature independent. The main contribution to the relaxation rate comes from contact interaction, while the Knight shift is governed by orbital interaction. The electric field gradient at the

1. Knight shift, spin-lattice relaxation and electric field gradient in
technetium metal
V P Tarasov , Yu B Muravlev and K E Guerman
Published 16 November 2001 • Journal of Physics: Condensed Matter, Volume 13, Number 48
Abstract
Spin-lattice relaxation time (T ), isotropic Knight shift (K ) and quadrupole coupling constant (C ) have been measured
in technetium metal by pulsed Tc NMR in a magnetic field of 7.04 T in the temperature range 120-400 K. It was found
that (T ×T) = 3.21±0.35 (s K) , K (T) = 7305-1.52T ppm; the quadrupole coupling constant C = 5.74±0.05 MHz is
temperature independent. Experimental data on T and K are analysed in terms of the contact, d-polarization and
1 1 2
Institute of General and Inorganic Chemistry, RAS, 117907, Moscow, Russia
UMR 5084, Chimie Nucl. Anal. Bioev., Le Haut Vigneau, BP 120, 33175 Gradignan Cedex, France
Received 21 November 2000
Published 16 November 2001
V P Tarasov et al 2001 J. Phys.: Condens. Matter 13 11041
http://dx.doi.org/10.1088/0953-8984/13/48/328
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1
2
1 iso Q
99
1
-1 -1
iso Q
1 iso

2. 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 Tc nucleus site is
considered to be a sum of the electron q and lattice q contributions with different signs. The calculated lattice
contribution is positive and constitutes about 30% of the electronic contribution. The obtained values of q and q are
compared with data for other metals with hexagonal close-packed lattices.
1 iso
99
el lat
el lat
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