Structure
Gallery Return
home 
This page contains some of the structures
I have modelled in the past. If you would like to get their atomic coordinates,
you can just email me.
Disclinations
in graphitic carbon and boron nitride: nanocones and saddles
Polyhedral
models of allophane et al.
F
phase (Mg21(Zn,Al)17)
Disclinations
in graphitic carbon and boron nitride: nanocones and saddles
The cone model shown
below is for a 180° disclination in carbon. Negative disclinations,
or saddles, have never been observed in real materials. 240° and 300°
disclinations were observed in boron nitride (see Publications
List) and corresponding models are shown below the carbon surfaces.
Polyhedral
models of allophane et al.
The two structures
shown below, courtesy of Dr. Les Bursill, are a graphitic sheet mapped
onto an icosahedron (as in the Fullerene family) and a tetrahedron. They
can be used as the basis for polyhedral models of allophane, an alumino-silicate
mineral consisting of 4 nm wide spheroidal shells. The third picture is
such a model using the octahedron as the basic polyhedron (see Publication
List).
Layers
in the F phase
This phase is one
of the two equilibrium ternary phases found in the Mg-Zn-Al alloy system.
It has composition Mg21(Zn,Al)17, space group Pbcm,
and lattice parameters a=0.90 nm, b=1.70 nm, c=1.97 nm (see Publication
List).
