gfactor of high-Zlithiumlike ions

The g factor of Li-like ions is evaluated in the range $Z=6\mathrm{}–92.$ The interelectronic-interaction correction of first order in $1/Z$ is calculated to all orders in $\alpha Z$ within a rigorous QED approach. The higher-order interelectronic-interaction, the one-electron QED, and the nuclear recoil corrections are evaluated to lowest orders in $\alpha Z.\mathrm{}$ It is found that the uncertainty due to the nuclear size effect can be significantly reduced in a specific difference of the g factors of H- and Li-like ions.