Ta2O5

Name: Ta2O5
Brand: MatWorld

ceramic

· Ta2O5

Tantalum pentoxide (Ta₂O₅) is a high-refractive-index ceramic oxide with excellent chemical stability and dielectric properties, commonly encountered as a thin-film material rather than a bulk ceramic. It is widely used in optics, microelectronics, and integrated photonics where its high refractive index and transparency across visible-to-near-infrared wavelengths enable miniaturized optical coatings, waveguides, and photonic integrated circuits. Engineers select Ta₂O₅ over alternative oxides when superior optical performance, thermal stability, and compatibility with semiconductor processing are required, though its density and processing complexity make it less suitable for structural applications.

optical thin films and coatingsintegrated photonics and waveguidesmicroelectronic capacitors and dielectricsinfrared opticsanti-reflective coatingsphotonic devices

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	18,716.7	ksi	DFT
↳	32,690.1	ksi	DFT · OptB88vdW
↳	18,320.9	ksi	DFT · PBE
Elastic Compliance Tensor(Sij)	Matrix (redacted)	1/GPa	DFT · PBE
Elastic Anisotropy(AU)	0.9280	-	DFT · PBE
Elastic Stiffness Tensor(Cij)	Matrix (redacted)	ksi	DFT · PBE
Poisson's Ratio(ν)2 entries	0.3500	-	DFT · OptB88vdW
↳	0.2640	-	DFT · PBE
Shear Modulus(G)3 entries	10,324.3	ksi	DFT
↳	15,192.7	ksi	DFT · OptB88vdW
↳	10,242.4	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.

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

Property	Value	Unit	Conditions	Source
Density(ρ)	0.2900	lb/in³	DFT · OptB88vdW

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

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Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)3 entries	4.200	eV	Measured
↳	3.177	eV	DFT · OptB88vdW
↳	4.273	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)	37.93	-	DFT · OptB88vdW
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	5.906	-	DFT · OptB88vdW
↳	4.550	-	DFT · TBmBJ
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.7858	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.00117	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000789	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-406.5	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	362	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.

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

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Method

Property	Value	Unit	Conditions
Energy Above Hull(ΔEhull)	0.06940	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-2.974	eV/atom	DFT · OptB88vdW
↳	-3.030	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.

Ta2O5 — Properties & Data | MatWorld

Ta2O5

Mechanical Properties

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental