CaO — Properties & Data | MatWorld

CaO

ceramic

· CaO

Calcium oxide (CaO), commonly known as quicklime, is an inorganic ceramic compound formed by the calcination of limestone. It is a highly reactive alkaline oxide widely used in construction, metallurgy, environmental treatment, and chemical processing industries. CaO is valued for its strong cementitious properties, high-temperature stability, and ability to react with moisture and acidic compounds, making it essential in applications requiring thermal durability, chemical reactivity, or pH control.

cement and concrete productionsteel manufacturing (desulfurization)lime kiln refractorieswater treatment and pH adjustmenthigh-temperature furnace liningschemical synthesis

Compliance & Regulations

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

Units:

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Method

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)3 entries	15,230	ksi	DFT
↳	16,429.9	ksi	DFT · OptB88vdW
↳	15,230	ksi	DFT · PBE
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	DFT · PBE
Elastic Anisotropy(AU)	0.00178	-	DFT · PBE
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	ksi	DFT · PBE
Poisson's Ratio(ν)2 entries	0.2200	-	DFT · OptB88vdW
↳	0.2141	-	DFT · PBE
Shear Modulus(G)3 entries	10,757.9	ksi	DFT
↳	11,468.1	ksi	DFT · OptB88vdW
↳	10,757.9	ksi	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
Thermal Conductivity(k)	8.667	BTU/(hr·ft·°F)	Measured

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Property	Value	Unit	Conditions	Source
Density(ρ)	0.1204	lb/in³	DFT · OptB88vdW

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Method

Carrier

Property	Value	Unit	Conditions	Source
Band Gap(Eg)3 entries	6.970	eV	Measured
↳	3.742	eV	DFT · OptB88vdW
↳	5.290	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)2 entries	14.85	-	DFT · OptB88vdW
↳	9.795 range 3.843–15.75median of 2 measurements	-	DFT · PBEsol
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	3.836	-	DFT · OptB88vdW
↳	3.116	-	DFT · TBmBJ
Electron Effective Mass(m*e)	0.5500	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	1.430	me	DFT · OptB88vdW · 27°C
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.000	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.00244	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00222	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-220.8	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	353.7	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	Source
Energy Above Hull(ΔEhull)	0.01170	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-3.261	eV/atom	DFT · OptB88vdW
↳	-3.290	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.