CaF,(Fluorite)AB,type C.N.+:C.N.=8:4 ·The packing of Cubic anions: .Bravais Lattice: Cubic F .The position of 2 Cubic cations: holes The C.N.of 8:4 cation and anion: ·Atom number in Ca:F=4:8 one unit cell: A:0,0,0:1/2,1/2,0,1/2,0,1/2;0,1/2,1/2 B:3/4,1/4,1/4;1/4,3/4,1/4,1/4,1/4,3/4;3/4,3/4,3/4 3/4,3/4,1/4,3/4,1/4,1/4,1/4,3/4,3/4,3/4,1/4,3/4 (>0.732)BaF2,PbF2,SrF2,HgF2,ThO2,CaF2,UO2,CeO2,PrO2,CdF2 (0.67)ZrF2,HfF2 Rb20,Li20 ---anti-Fluorite structure type The packing of anions? The position of cations? ·Bravais Lattice? ·TheC.N.of anion and cation? .Atom number in one unit cell?CaF2 (Fluorite) AB2 type C.N.+:C.N.- =8:4 A: 0,0,0; 1/2,1/2,0, 1/2,0,1/2; 0,1/2,1/2 B: 3/4,1/4,1/4; 1/4,3/4,1/4; 1/4,1/4,3/4; 3/4,3/4,3/4 3/4,3/4,1/4; 3/4,1/4,1/4; 1/4,3/4,3/4; 3/4,1/4,3/4 (>0.732) BaF2, PbF2, SrF2, HgF2, ThO2, CaF2, UO2, CeO2, PrO2, CdF2; (0.67) ZrF2, HfF2 •Bravais Lattice : Cubic F • Atom number in Ca:F = 4:8 one unit cell: The C.N. of 8:4 cation and anion: ½ Cubic holes •The position of cations: • The packing of Cubic anions: Rb2O, Li2O --- anti- Fluorite structure type • The packing of anions? • The position of cations? • Bravais Lattice ? • The C.N. of anion and cation? •Atom number in one unit cell?