What are the coordination numbers of Li and S ions in a unit cell of Lithium sulfide crystal?

Ive an image of it and i think its 4 and 4 but then its wrong?


Please help?


Thanks!What are the coordination numbers of Li and S ions in a unit cell of Lithium sulfide crystal?



As there must be twice as many lithium ions as sulphide ions, the 'numbers' must be different.


It's 4:8. i.e. 4 sulphides around each lithium; and 8 lithiums around each sulphur.


It's an antifluorite structure.What are the coordination numbers of Li and S ions in a unit cell of Lithium sulfide crystal?
Sulfide crystal?


or crystal meth ;)

soccer