It has been estimated that the transition from a mixture of ammonia and dihydrogen molecules to metallic ammonium may occur at pressures just below 25 GPa.
ɪt hˈæzbiːn ˈɛstᵻmˌeɪɾᵻd ðætðə tɹænsˈɪʃən fɹʌm ɐ mˈɪkstʃɚɹ ʌv æmˈoʊniə ænd daɪhˈaɪdɹədʒən mˈɑːlɪkjˌuːlz tə mətˈælɪk æmˈoʊniəm mˈeɪ əkˈɜːɹ æt pɹˈɛʃɚz dʒˈʌst bᵻlˌoʊ twˈɛnti fˈaɪv dʒˌiːpˌiːˈeɪ.