Crystallography question

Thread Starter

boks

Joined Oct 10, 2008
218
According to my handbook, rutile (\[TiO_2\]) has a primitive tetragonal cell consisting of 6 atoms. How is that possible when each lattice point contains 1/8 atom or molecule?
 

studiot

Joined Nov 9, 2007
5,003
How is that possible when each lattice point contains 1/8 atom or molecule?
The rutile structure is not close packed. It shows 6:3 coordination which means that each titanium atom is surrounded by 6 (not 8) oxygen atoms arranged at the vertices of an octahedron.

An octahedon has 8 faces but only 6 vertices


Each oxygen is coordinated to 3 titaniums in a planar equilateral triangle.
 
Top