Americium(III) iodide or americium triiodide is the chemical compound, a salt composed of americium and iodine with the formula AmI3.
Americium(III) iodide can be prepared by reacting americium(III) chloride with ammonium iodide:[2] Americium(III) iodide takes the form of yellow crystals.
It crystallizes in the trigonal crystal system in the space group R3 (space group no.
148) with the lattice parameters a = 742 pm and c = 2055 pm and six formula units per unit cell.
Its crystal structure is isotypic with bismuth(III) iodide.