HoB4

ceramic

· HoB4

HoB4 is a ceramic compound in the boride family, specifically a rare-earth metal boride where holmium combines with boron to form a hard, refractory ceramic. This material belongs to the broader class of transition metal and rare-earth borides, which are valued for extreme hardness and high-temperature stability. HoB4 remains primarily a research and development compound rather than a widely commercialized engineering material, but rare-earth borides show promise in applications demanding exceptional wear resistance and thermal stability at extreme conditions.

refractory coatingshigh-temperature ceramicswear-resistant compositesresearch applicationshardening phases

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Density(ρ)	6.887	kg/m³	—

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

Property	Unit	Conditions
Band Gap(Eg)2 entries	eV	—
↳	eV	—
Magnetic Moment(μB)	µB	—

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
Energy Above Hull(ΔEhull)	0.000	eV/atom	—
Formation Energy(ΔHf)	-0.6161	eV/atom	—

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

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.

HoB4

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental