Question

How can we convert CsCl structure into NaCl structure and vice versa?

Answer 1

Increase in pressure increases the coordination number and increase in temperature lowers the coordination number.

For example:

On increasing the temperature of CsCl structure coordination number decreases from
8 : 8 to 6 : 6

On subjecting the NaCl structure to high pressure, it will increase coordination number from 6: 6 to 8: 8.