Terbium(III) iodide (TbI3) is an inorganic chemical compound. Production Terbium(III) iodide can be produced by reacting terbium and iodine. An alternative method is reacting terbium and mercury(II) iodide at 500 °C. Structure Terbium(III) iodide adopts the bismuth(III) iodide (BiI3) crystal structure type, with octahedral coordination of each Tb3+ ion by 6 iodide ions. References Iodides Terbium compounds Lanthanide halides