Mumbai university > FE > SEM 1 > Applied Physics 1

Marks: 3M

Year: Dec 2014

Cesium Chloride (CsCI)

• Cesium chloride crystallizes in a cubic lattice.

• CsCl crystallizes in a cubic unit cell.

• The length of the unit cell edge is 0.4123 nm.

• There is a $Cl^-$ ion at the coordinates 0, 0, 0.

• There is a $Cs^+$ ion at the coordinates 1/2, 1/2, 1/2.

No. of atoms per unit cell is 1

The unit cell may be depicted as shown.

($Cs^+$ is teal, $Cl^-$ is gold).

BaTiO3-is a well-known classic ferroelectric that has a wide range of applications from dielectric capacitors to non-linear optic devices. At high temperatures, BaTiO3 is paraelectric with a cubic structure. When the temperature decreases to below 125 °C, paraelectric cubic BaTiO3 trans-forms to a ferroelectric tetragonal phase.