Hafnium
A zirconium by-product that forms hafnium oxide — the 'high-k' gate dielectric inside nearly every advanced logic transistor.
Hafnium oxide gate dielectrics are used in leading-edge logic chips including AI accelerators; also in superalloys for turbines.
Global production is tiny and tied to nuclear-grade zirconium refining; USGS does not publish world production.
Who calls it critical
Membership on each government list. “Strategic” marks a higher tier where the list has one; “group” means included as part of a group such as rare earths or PGMs.
Hafnium: key questions
- Where is hafnium mined or produced?
- Country-level production data for Hafnium is limited or withheld in USGS statistics.
- Is hafnium a critical mineral?
- Hafnium appears on 5 of the 10 official lists we track (United States, European Union, United Kingdom, India, Australia).
- Is hafnium in short supply?
- Our supply status: Watch. Global production is tiny and tied to nuclear-grade zirconium refining; USGS does not publish world production.
- Why does hafnium matter for AI infrastructure?
- Hafnium oxide gate dielectrics are used in leading-edge logic chips including AI accelerators; also in superalloys for turbines.
Related minerals
ExplorerGallium
TightA by-product of aluminum refining that becomes gallium nitride (GaN) and gallium arsenide (GaAs) — the materials of power electronics, RF chips and lasers.
Indium
TightA soft by-product metal used in touchscreens (ITO) and in indium phosphide — the compound semiconductor behind many high-speed optical lasers.
Germanium
TightA semiconductor metal recovered from zinc and coal ash, essential for fiber-optic cores, infrared optics and high-speed SiGe chips.