Increase of pressure increases the coordination number during crystallization e.g. by applying pressure the NaCl type crystal structure having 6:6 coordination number changes to CsCl type crystal having coordination number 8:8.
Increase of temperature decreases the coordination number, e.g. upon heating to 760 K, the CsCl type crystal structure having coordination 8:8 changed to NaCl type crystal structures having coordination 6:6.