[Wien] about the NiO

[Stefaan Cottenier]

> in the UG, P 78, it says that the NiO includes two inequivlent Ni
> atoms,
> but, in related books, the structure of NiO is as follows:
> 
> Ni, (0,0,0)
> O, (1/2,1/2,1/2)........F.C.
> 
> which one is right?

Both, I think. NiO is an antiferromagnet. The 2 Ni which are 
inequivalent for wien are so because they have their moment up and 
down. But chemically, they are equivalent (and that's what you'll find 
in lattice structure books).

Stefaan