Question

How can you convert nacl structure to cscl structure and vice versa

Answer 1

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.

Answer 2

Increase in pressure increases the coordination number and increase in temperature lowers the coordination number. That means on increasing the temperature of CsCl structure coordination number decreases from

8 : 8 to 6 : 6 and on increasing the pressure of NaCl structure to high pressure, it will increase coordination number from 6: 6 to 8: 8.