BeF2

Name: BeF2
Brand: MatWorld

ceramic

· BeF2

Beryllium fluoride (BeF₂) is an inorganic ceramic compound belonging to the fluoride ceramic family, known for its exceptional optical transparency across infrared wavelengths and high chemical stability. While primarily investigated in research and specialized optical applications rather than mainstream industrial use, BeF₂ is of particular interest for infrared optics, laser windows, and high-temperature thermal applications where superior transparency and thermal durability are required. Engineers consider this material when standard optical ceramics (like sapphire or fused silica) are inadequate for IR transmission or when extreme chemical resistance combined with optical clarity is critical.

infrared optics and windowslaser componentshigh-temperature optical applicationschemical containment vesselsthermal sensor windowsresearch and development

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	0.000	ksi	DFT · OptB88vdW
Poisson's Ratio(ν)	0.1300	-	DFT · OptB88vdW
Shear Modulus(G)	0.000	ksi	DFT · OptB88vdW

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

Property	Value	Unit	Conditions	Source
Density(ρ)	0.04747	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	8.702	eV	DFT · OptB88vdW
↳	12.28	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)3 entries	3.418	-	DFT · OptB88vdW
↳	3.390	-	DFT · PBE
↳	2.658 range 1.829–3.487median of 2 measurements	-	DFT · PBEsol
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	1.835	-	DFT · OptB88vdW
↳	1.499	-	DFT · TBmBJ
Electronic Dielectric Tensor(ε∞)	Matrix (redacted)	-	DFT · PBE
Total Dielectric Tensor(ε)	Matrix (redacted)	-	DFT · PBE
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)2 entries	0.02350	C/m²	DFT · OptB88vdW
↳	0.06646	C/m²	DFT · PBE
Piezoelectric Stress Tensor(eij)	Matrix (redacted)	C/m²	DFT · PBE
Thermoelectric Power Factor(PF)2 entries	0.000967	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000339	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-154.2	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	509.1	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.

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Method

Property	Value	Unit	Conditions
Energy Above Hull(ΔEhull)	0.01120	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-3.429	eV/atom	DFT · OptB88vdW
↳	-3.547	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.

BeF2 — Properties & Data | MatWorld

BeF2

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental