%0 Journal Article
%A Michael C Tucker
%A Marca M Doeff
%A Thomas J Richardson
%A Rita Fiñones
%A Elton J Cairns
%A Jeffrey A Reimer
%B Journal of the American Chemical Society
%D 2002
%G eng
%N 15
%P 3832-3833
%R 10.1021/ja017838m
%T Hyperfine fields at the Li site in LiFePO<sub>4</sub>-type olivine materials for lithium rechargeable batteries: A <sup>7</sup>Li MAS NMR and SQUID study
%V 124
%3 <p>cairns group, doeff group</p>
%8 04/2002
%X <p>The <sup>7</sup>Li NMR isotropic shift for olivine LiMPO<sub>4</sub> (M = Fe, Mn, Co, Ni) is assigned to hyperfine coupling between the <sup>7</sup>Li nucleus and the transition metal unpaired electrons on the basis of the Curie−Weiss temperature dependence of the shift. The hyperfine shift arises from a linear combination of Li−O−M through-bond interactions wherein the unpaired A‘ electrons contribute a negative shift and the unpaired A‘&thinsp;‘ electrons contribute a positive shift. The hyperfine coupling constant is determined for each composition.</p>