Fluoride Model Systems: III, The System NaF–BeF2 and the Polymorphism of Na2BeF4 and BeF2 A revised equilibrium diagram is presented for the system NaF–BeF 2 , a weakened model of the system CaO–SiO 2 . The compound Na 2 BeF 4 has four struct... DM Roy,R Roy,EF Osborn - 《...