Why the coordination number of CsCl changes from 8 : 8 to 6 : 6 coordination?

Assertion : Coordination structure of CaCI changes from 8:8 to 6 : 6 on heating Reason: The crystal structure CaCI changed in NaCI on heating

What is the coordination number of Cs^(+) in CsCl ?

CsCl has coordination number ratio

8:8 coordination of CsCl is found to change into 6:6 coordination :

8:8 coordination of CsCl is found to change into 6:6 coordination :

What is the coordination unmber of Cs^(+) in CsCl ?