HfSi2 — Properties & Data | MatWorld

HfSi2

ceramic

· HfSi2

Hafnium disilicide (HfSi2) is an intermetallic ceramic compound belonging to the refractory silicide family, characterized by exceptionally high melting points and oxidation resistance at elevated temperatures. It is primarily used in ultra-high-temperature structural applications and thermal protection systems, particularly in aerospace propulsion and hypersonic vehicle design where materials must withstand extreme thermal cycling and oxidative environments. HfSi2 offers advantages over competing refractory ceramics and metal alloys due to its combination of rigidity at temperature, relatively low density compared to other refractory silicides, and chemical stability in oxygen-rich atmospheres, making it valuable for applications where conventional nickel-based superalloys or alumina ceramics reach their performance limits.

hypersonic vehicle structuresrocket engine nozzlesthermal protection systemshigh-temperature coatingsaerospace propulsion componentsrefractory composite reinforcement

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	131.9	GPa	DFT
↳	129.2	GPa	DFT · OptB88vdW
↳	131.9	GPa	DFT · PBE
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	DFT · PBE
Elastic Anisotropy(AU)	0.3092	-	DFT · PBE
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	Pa	DFT · PBE
Poisson's Ratio(ν)2 entries	0.2200	-	DFT · OptB88vdW
↳	0.2132	-	DFT · PBE
Shear Modulus(G)3 entries	93.55	GPa	DFT
↳	91.37	GPa	DFT · OptB88vdW
↳	93.55	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.

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Property	Value	Unit	Conditions	Source
Density(ρ)	7.796	kg/m³	DFT · OptB88vdW

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Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	0.000	eV	DFT · OptB88vdW
↳	0.000	eV	DFT · TBmBJ
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.00318	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00334	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-38.31	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	-40.12	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C

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
Energy Above Hull(ΔEhull)	0.00670	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-0.4843	eV/atom	DFT · OptB88vdW

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.

HfSi2

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental