KI — Properties & Data | MatWorld

KI

Name: KI
Brand: MatWorld

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

Units:

si imperial

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Method

Property	Value	Unit	Conditions
Bulk Modulus(K)3 entries	9.521	GPa	DFT
↳	13.77	GPa	DFT · OptB88vdW
↳	9.510	GPa	DFT · PBE
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	DFT · PBE
Elastic Anisotropy(AU)	1.290	-	DFT · PBE
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	Pa	DFT · PBE
Poisson's Ratio(ν)2 entries	0.3000	-	DFT · OptB88vdW
↳	0.2559	-	DFT · PBE
Shear Modulus(G)3 entries	5.550	GPa	DFT
↳	7.140	GPa	DFT · OptB88vdW
↳	5.545	GPa	DFT · PBE

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, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Property	Value	Unit	Conditions	Source
Density(ρ)	3.186	kg/m³	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

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Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)3 entries	6.310	eV	Measured
↳	4.092	eV	DFT · OptB88vdW
↳	6.384	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)2 entries	4.946	-	DFT · OptB88vdW
↳	4.435 range 2.956–9.300median of 4 measurements	-	DFT · PBEsol
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	3.205	-	DFT · OptB88vdW
↳	2.593	-	DFT · TBmBJ
Electron Effective Mass(m*e)	0.3200	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	2.380	me	DFT · OptB88vdW · 27°C
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.000	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.000581	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00144	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-87.78	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	379.5	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	0.000	%	DFT · TBmBJ

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, or test environment.

Verified Unverified Low confidence (<80%) Link to source

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Method

Property	Value	Unit	Conditions
Energy Above Hull(ΔEhull)	0.01970	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-1.563	eV/atom	DFT · OptB88vdW
↳	-1.699	eV/atom	Measured

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, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data

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.

KI

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Regulatory Screening

Environmental