[neon flash!]

can someone post a pic of the rocksalt projection for me plz.

we have to draw it on the ab plane, and label the c (z) height.

i know how to draw it 3d with Cl in each corner and face centre then Na the octahedra positions (ie. in the centre of each line)
but when i go to draw it on the ab plane i get really confused.

i've got this - which shows al my corners and then the 2 oxgyens on the top and bottom face, but i dont know how to place the Na's

[Dan]

The Na and Cl atoms stack up on top of each other in the c axis, I guess this is what is making the representation difficult to grasp. The normal way of doing it is:



In this diagram, the 0 and 1 labels are implicit and have not been specified - i.e. if there is a Cl at 0.5, then there are Na atoms at 0 and at 1. If there is a Na at 0.5 there are Cl atoms at 0 and 1.

[AWK]

http://cst-www.nrl.navy.mil/lattice/struk/b1.html