What Is The Crystal Structure Of Sodium Sulfate?

The crystal structure of sodium sulfate is a monoclinic system, meaning it has one unique axis of symmetry. The unit cell contains two formula units of Na2SO4 and has dimensions of approximately 11.5 Å x 6.7 Å x 6.2 Å. The space group is P21/c and the lattice parameters are a = 12.021 Å, b = 11.060 Å, c = 6.865 Å, and β = 103.31°. The sulfate anions form tetrahedral units that share corners and are connected by bridges of sodium ions. This results in layers of alternating Na and SO4 groups that stack on top of each other to form the crystal structure.