ˈɔːlsoʊ nˈoʊn æz hˈæfniəm daɪˈɑːksaɪd ɔːɹ hˈæfniə, ðɪs kˈʌlɚləs sˈɑːlɪd ɪz wˈʌn ʌvðə mˈoʊst kˈɑːmən ænd stˈeɪbəl kˈɑːmpaʊndz ʌv hˈæfniəm.
Also known as hafnium dioxide or hafnia, this colourless solid is one of the most common and stable compounds of hafnium.