Si4 Hf2

semiconductor

· Si4 Hf2

Si₄Hf₂ is an experimental hafnium-silicon compound in the ultra-high-temperature ceramic (UHTC) material family, designed for extreme thermal and mechanical environments. This material is primarily investigated in aerospace and materials research contexts for applications requiring exceptional thermal stability and refractory properties at temperatures where conventional materials degrade. Engineers consider hafnium-silicon compounds as potential alternatives to traditional refractory ceramics and composites in niche high-performance applications, though commercialization remains limited and material characterization is ongoing.

aerospace thermal protectionultra-high-temperature ceramicsrefractory materials researchhypersonic vehicle structuresmaterials science researchextreme environment coatings

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)	129.2	GPa	—
Shear Modulus(G)	91.37	GPa	—

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

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	0.00340	eV	—

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

Property	Value	Unit	Conditions	Source
Formation Energy(ΔHf)	-0.4840	eV/atom	—

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

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.

Si4 Hf2

Mechanical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental

Export Control