. . "hafnium(IV) oxide" . . "hafnium oxide" . . . "Hafnium(IV) oxide" . "Hafnia" . "hafnia" . "Hafnium(IV) oxide" . . . "Hafnium(IV) oxide" . . . . . . . . "Hafnium dioxide" . "HfO₂" . . . . "Hafnia" . . .