NaCl has a cubic unit cell. It is best thought of as a face-centered cubic array of anions with an interpenetrating fcc cation lattice (or vice-versa). The cell looks the same whether you start with anions or cations on the corners. Each ion is 6-coordinate and has a local octahedral geometry.
Structural Information
NaCl Vital Statistics
Formula NaCl
Cystal System Cubic
Lattice Type Face-Centered
Space Group Fm3m, No. 225
Cell Parameters a = 5.6402 Å, Z=4
Atomic Positions Cl: 0, 0, 0 Na: 0.5, 0.5, 0.5
(can interchange if desired)
Density 2.17
Melting Point 804 degrees C
Alternate Names Halite, rock salt, sea salt,
table salt, salt
Isostructural
Compounds MgO, TiO, TiC, LaN, NaI
KCl, RbF, AgCl, SrS
No comments:
Post a Comment