hˈæfniə ɪz jˈuːzd ɪn ˈɑːptɪkəl kˈoʊɾɪŋz, ænd æz ɐ hˈaɪkˈæpə daɪəlˈɛktɹɪk ɪn dɹˈæm kəpˈæsɪɾɚz ænd ɪn ɐdvˈænst mˈɛɾəl ˈɑːksaɪd sˌɛmɪkəndˈʌktɚ dɪvˈaɪsᵻz.
Hafnia is used in optical coatings, and as a high-κ dielectric in DRAM capacitors and in advanced metal–oxide–semiconductor devices.