Hafnium dioxide (HfO2) is a refractory ceramic oxide with high density and strong elastic properties, widely used in applications demanding thermal stability and electrical functionality. It serves as a high-κ dielectric in advanced semiconductor gate stacks, thermal barrier coatings in gas turbines and aerospace engines, and crucible/liner material in high-temperature metallurgical processes. Engineers select HfO2 over alternatives like SiO2 or Al2O3 when extreme temperature resistance, superior dielectric performance, or enhanced radiation stability are critical requirements.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)3 entries | 29,670.9 | ksi | DFT | ||
| ↳ | 34,137.5 | ksi | DFT · OptB88vdW | ||
| ↳ | 29,670.9 | ksi | DFT · PBE | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | DFT · PBE | ||
Elastic Anisotropy(AU) | 0.3858 | - | DFT · PBE | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | ksi | DFT · PBE | ||
Poisson's Ratio(ν)2 entries | 0.2800 | - | DFT · OptB88vdW | ||
| ↳ | 0.2924 | - | DFT · PBE | ||
Shear Modulus(G)3 entries | 14,295.6 | ksi | DFT | ||
| ↳ | 17,607.6 | ksi | DFT · OptB88vdW | ||
| ↳ | 14,295.6 | ksi | DFT · PBE |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.3795 | lb/in³ | DFT · OptB88vdW |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)3 entries | 5.550 | eV | Measured | ||
| ↳ | 4.123 | eV | DFT · OptB88vdW | ||
| ↳ | 5.664 | eV | DFT · TBmBJ | ||
Dielectric Constant (Relative Permittivity)(εr)3 entries | 35.32 | - | DFT · OptB88vdW | ||
| ↳ | 18.75 | - | DFT · PBE | ||
| ↳ | 16.97 range 4.659–29.27median of 2 measurements | - | DFT · PBEsol | ||
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries | 4.862 | - | DFT · OptB88vdW | ||
| ↳ | 3.855 | - | DFT · TBmBJ | ||
Electronic Dielectric Tensor(ε∞) | Matrix (redacted) | - | DFT · PBE | ||
Total Dielectric Tensor(ε) | Matrix (redacted) | - | DFT · PBE | ||
Magnetic Moment(μB) | 0.000 | µB | DFT · OptB88vdW | ||
Piezoelectric Modulus(eij)2 entries | 0.000 | C/m² | DFT · OptB88vdW | ||
| ↳ | 1.219 | C/m² | DFT · PBE | ||
Piezoelectric Stress Tensor(eij) | Matrix (redacted) | C/m² | DFT · PBE | ||
Thermoelectric Power Factor(PF)2 entries | 0.00117 | W/(m·K²) | DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C | ||
| ↳ | 0.00144 | W/(m·K²) | DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C | ||
Seebeck Coefficient(S)2 entries | -238.4 | μV/K | DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C | ||
| ↳ | 362.5 | μV/K | DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C | ||
Spectroscopic Limited Maximum Efficiency (SLME)(SLME) | 0.000 | % | DFT · TBmBJ |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.01180 | eV/atom | DFT · OptB88vdW | ||
Formation Energy(ΔHf)2 entries | -3.798 | eV/atom | DFT · OptB88vdW | ||
| ↳ | -3.861 | eV/atom | Measured |
Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data