TlI

Name: TlI
Brand: MatWorld

ceramic

· TlI

Thallium iodide (TlI) is an ionic ceramic compound belonging to the halide family, characterized by a rock salt crystal structure with relatively high density. Historically studied for infrared optical applications and radiation detection, TlI has limited modern industrial use due to thallium's toxicity and the availability of superior alternatives like cesium iodide and sodium iodide for scintillation and imaging. Its primary research interest today remains in specialized optoelectronic and photodetector applications where its bandgap and optical properties offer potential advantages, though commercial adoption is constrained by health, regulatory, and performance considerations.

infrared optics (experimental)radiation detection (research)scintillation detectors (legacy/niche)photodetector materials (developmental)semiconductor compounds (thin film research)

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	3,114	ksi	DFT · OptB88vdW
Poisson's Ratio(ν)	0.3100	-	DFT · OptB88vdW
Shear Modulus(G)	1,406.9	ksi	DFT · OptB88vdW

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

Property	Value	Unit	Conditions	Source
Density(ρ)	0.2646	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)2 entries	2.204	eV	DFT · OptB88vdW
↳	2.874	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)2 entries	39.92	-	DFT · OptB88vdW
↳	28.75 range 7.632–49.86median of 2 measurements	-	DFT · PBEsol
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	6.988	-	DFT · OptB88vdW
↳	5.620	-	DFT · TBmBJ
Electron Effective Mass(m*e)	0.2533	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	2.633	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	0.00215	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00276	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-162.2	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	338.2	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	6.140	%	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)	0.00880	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-0.6636	eV/atom	DFT · OptB88vdW
↳	-0.6410	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.

TlI — Properties & Data | MatWorld

TlI

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental