HgI

Name: HgI
Brand: MatWorld

semiconductor

· HgI

Mercury iodide (HgI) is an inorganic semiconductor compound combining mercury and iodine, belonging to the II-VI semiconductor family. Historically, it has been investigated for gamma-ray and X-ray detection applications due to its high atomic number and resulting strong interaction with high-energy radiation, though it remains largely a research material with limited commercial deployment compared to more stable alternatives like cadmium zinc telluride (CZT). Engineers considering HgI should be aware that it is primarily of academic and specialized research interest; its toxicity, chemical instability, and processing challenges have limited practical industrial adoption, making it relevant mainly for niche radiation detection research rather than mainstream engineering applications.

gamma-ray detectionX-ray spectroscopyradiation sensing (research)semiconductor researchhigh-energy physics instrumentationnuclear detection systems

Compliance & Regulations

?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	3,427.2	ksi	DFT · OptB88vdW
Poisson's Ratio(ν)	0.3500	-	DFT · OptB88vdW
Shear Modulus(G)	1,679.5	ksi	DFT · OptB88vdW

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

Property	Value	Unit	Conditions	Source
Density(ρ)	0.2708	lb/in³	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	2.370	eV	Measured
↳	1.476	eV	DFT · OptB88vdW
↳	2.067	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)	22.41	-	DFT · OptB88vdW
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	10.14	-	DFT · OptB88vdW
↳	7.056	-	DFT · TBmBJ
Electron Effective Mass(m*e)	0.8367	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	1.317	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	0.00545	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00265	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-225.7	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	368.6	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	21.49	%	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.

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Method

Property	Value	Unit	Conditions
Energy Above Hull(ΔEhull)	0.02290	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-0.09320	eV/atom	DFT · OptB88vdW
↳	-0.3083	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

Export Control

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.

HgI — Properties & Data | MatWorld

HgI

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental

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