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 | — | ||
| ↳ | 29,670.9 | ksi | — | ||
| ↳ | 34,137.5 | ksi | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 0.3858 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | ksi | — | ||
Poisson's Ratio(ν)2 entries | 0.2924 | - | — | ||
| ↳ | 0.2800 | - | — | ||
Shear Modulus(G)3 entries | 14,295.6 | ksi | — | ||
| ↳ | 14,295.6 | ksi | — | ||
| ↳ | 17,607.6 | ksi | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.3795 | lb/in³ | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)2 entries | 5.550 | eV | — | ||
| ↳ | 4.315 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr)3 entries | 18.75 | - | — | ||
| ↳ | 35.32 | - | — | ||
| ↳ | 16.97 range 4.659–29.27median of 2 measurements | - | — | ||
Electronic Dielectric Tensor(ε∞) | Matrix (redacted) | - | — | ||
Total Dielectric Tensor(ε) | Matrix (redacted) | - | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Piezoelectric Modulus(eij)2 entries | 1.219 | C/m² | — | ||
| ↳ | 0.000 | C/m² | — | ||
Piezoelectric Stress Tensor(eij) | Matrix (redacted) | C/m² | — | ||
Seebeck Coefficient(S) | -285.6 | µV/K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.01180 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -3.861 | eV/atom | — | ||
| ↳ | -3.798 | eV/atom | — |