Americium(III) iodide

Americium(III) iodide or americium triiodide is the chemical compound, a salt composed of americium and iodine with the formula AmI3.

Preparation
Americium(III) iodide can be prepared by reacting americium(III) chloride with ammonium iodide:


 * AmCl3 + 3 NH4I -> AmI3 + 3NH4Cl

Properties
Americium(III) iodide takes the form of yellow crystals. The crystal form is orthorhombic. It melts around 960 °C. The density is 6.9 g/cm3. The compound consists of Am3+ and I− ions. It crystallizes in the trigonal crystal system in the space group R$\overline{3}$ (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.