KI
ceramic· KI
Potassium iodide (KI) is an ionic ceramic compound—a halide salt with a face-centered cubic crystal structure—valued for its optical transparency across the visible and infrared spectrum. It is widely used in scintillation detectors for radiation monitoring and medical imaging, in optics for infrared windows and lenses, and historically in photographic emulsions and pharmaceutical applications. Engineers select KI for its high refractive index, radiation detection efficiency, and ability to transmit mid-infrared wavelengths where many polymers absorb; however, its hygroscopicity and relative brittleness limit applications to dry, controlled environments.
gamma-ray scintillation detectorsinfrared optics and windowsradiation monitoring equipmentmedical imaging systemslaboratory spectroscopy
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)3 entries | 9.510 | GPa | — | ||
| ↳ | 9.521 | GPa | — | ||
| ↳ | 13.77 | GPa | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 1.290 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | Pa | — | ||
Poisson's Ratio(ν)2 entries | 0.2559 | - | — | ||
| ↳ | 0.3000 | - | — | ||
Shear Modulus(G)3 entries | 5.545 | GPa | — | ||
| ↳ | 5.550 | GPa | — | ||
| ↳ | 7.140 | GPa | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 3.186 | kg/m³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)2 entries | 6.310 | eV | — | ||
| ↳ | 4.000 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr)2 entries | 4.946 | - | — | ||
| ↳ | 4.435 range 2.956–9.300median of 4 measurements | - | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Piezoelectric Modulus(eij) | 0.000 | C/m² | — | ||
Seebeck Coefficient(S) | -87.78 | µV/K | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.01970 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -1.699 | eV/atom | — | ||
| ↳ | -1.563 | eV/atom | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.