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The hyperfine splitting of the ground state of selected B-like ions withinthe range of nuclear charge numbers $Z=49-83$ is investigated in detail. Therigorous QED approach together with the large-scale configuration-interactionDirac-Fock-Sturm method are employed for the evaluation of theinterelectronic-interaction contributions of first and higher orders in $1/Z$.The screened QED corrections are evaluated to all orders in $\alpha Z$ by usingan effective potential. The influence of nuclear magnetization distribution istaken into account within the single-particle nuclear model.

Ground-state hyperfine splitting of B-like ions in high-Z region