Cadmium iodide CdI₂

Unit cell

Lattice constants

a = 4.240 Å, b = 4.240 Å, c = 6.840 Å; α = 90°, β = 90°, γ = 120°

Cell volume

106.5 ų

Atoms in the cell

3 (Cd 1, I 2)

Formula units Z

1

Calculated density

5.71 g cm⁻³

Shortest contact

2.986 Å

Coordination

Cd

CN 6 at 2.99 Å (6 I)

I

CN 3 at 2.99 Å (3 Cd)

About the structure

• hcp array of I⁻ with Cd²⁺ in every other layer of octahedral holes.
• Layers I–Cd–I are neutral sandwiches held together only by dispersion forces.
• Mg(OH)₂ (brucite), Ca(OH)₂, PbI₂, TiS₂, VS₂ share this structure.

Atom positions (fractional, one cell)

Z, coordination numbers, distances, density and packing on this page are computed from these coordinates.