CrO2

semiconductor

· CrO2

CrO₂ is a transition metal oxide semiconductor with a mixed-valence chromium structure, notable for its ferrimagnetic properties and relatively high density. Historically significant as the magnetic coating material in cassette tapes and magnetic recording media during the analog era, CrO₂ offers superior coercivity and remanence compared to earlier gamma-Fe₂O₃, making it the preferred choice for high-fidelity audio and data storage applications. While largely displaced by digital technologies, CrO₂ remains relevant in specialized magnetic applications, catalysis (particularly for oxidation reactions), and emerging research into multiferroic and spintronics devices where its magnetic-semiconductor nature is advantageous.

magnetic recording mediaferrimagnetic coatingscatalytic oxidation processeshigh-coercivity magnetsspintronics researchlegacy audio/data storage

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)2 entries	28,517.5	ksi	—
↳	7,148.9	ksi	—
Poisson's Ratio(ν)	0.2700	-	—
Shear Modulus(G)2 entries	14,620.8	ksi	—
↳	4,135	ksi	—

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
Density(ρ)	0.1557	lb/in³	—

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

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	0.2300	eV	—
↳	0.000	eV	—
Magnetic Moment(μB)	2.000	µB	—
Seebeck Coefficient(S)	8.717	µV/K	—

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)	0.2192	eV/atom	—
Formation Energy(ΔHf)	-1.892	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.

CrO2

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental

Export Control