# Hafnium dioxide, HfO2

Hafnium dioxide (HfO2) is a high-index, low-absorption material used extensively in optical applications. It is especially valuable for making thin-film dielectric coatings for mirrors, anti-reflective coatings, and beam splitters. Due to its excellent thermal stability and resistance to chemical corrosion, it is well-suited for harsh environments. Additionally, its high refractive index makes it an attractive material for planar waveguides and other integrated optics components. Beyond its optical uses, hafnium dioxide is also a key material in the fabrication of advanced gate dielectrics in field-effect transistors, contributing to the miniaturization and performance improvement of electronic devices.

## Other names

- Hafnia
- Hafnium(IV) oxide
- Hafnium oxide

## External links

- Hafnium(IV) oxide - Wikipedia
- Hafnium dioxide - WebElements