ɪɾ ɪz ɐn ᵻlˈɛktɹɪkəl ˈɪnsəlˌeɪɾɚ wɪð ɐ bˈænd ɡˈæp ʌv fˈaɪv.θɹˈiː tˈɪldə fˈaɪv.sˈɛvən ˈiː vˈiː. hˈæfniəm daɪˈɑːksaɪd ɪz ɐn ˌɪntɚmˈiːdiət ɪn sˌʌm pɹˈɑːsɛsᵻz ðæt ɡˈɪv hˈæfniəm mˈɛɾəl.
It is an electrical insulator with a band gap of 5.3~5.7 eV. Hafnium dioxide is an intermediate in some processes that give hafnium metal.