Cesium iodide (CsI) is an inorganic ionic ceramic compound composed of cesium and iodine elements, forming a crystalline solid with cubic crystal structure. It is primarily used in radiation detection systems, scintillation counters, and medical imaging equipment where its high atomic number enables efficient detection of gamma rays and X-rays. CsI is also employed in specialized optical applications and as a component in certain electrochemical devices; its selection over alternatives typically reflects requirements for high radiation stopping power, good light output in scintillation applications, or specific wavelength transparency in the infrared region.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)2 entries | 7.383 | GPa | — | ||
| ↳ | 7.383 | GPa | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 2.131 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | Pa | — | ||
Poisson's Ratio(ν) | 0.2760 | - | — | ||
Shear Modulus(G)2 entries | 3.888 | GPa | — | ||
| ↳ | 3.888 | GPa | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 6.400 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr) | 4.206 range 2.878–5.534median of 2 measurements | - | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Formation Energy(ΔHf) | -1.795 | eV/atom | — |