Likewise, the triangulated layers of spheres (atoms) can be stacked vertically in .
the eclipsed formation or staggered. .
.  

 

 
 

hp.gif

hp.gif

 

click image

 

to enlarge

overhead view
   
   

Figure 35 -  Simple hexagonal (HP) packing of spheres

.      
.
Simple hexagonal packing (HP) .
     Stacking them vertically results in the simple hexagonal or hexagonal primitive
(HP) packing arrangement.  It is called this because each sphere is coordinated with
six surrounding spheres in the same layer.  Atoms packed together in this way can .
can be modeled as a space filling of trigonal and hexagonal prisms. .
.

hp.gif

 
 
Figure 36 -  HP polyhedral framework model
                 ( 30 T, 35 S, 79 pinges)
                            click image to enlarge
.
     Each sphere has a coordination number of eight - the six surrounding spheres in .
the same layer and one sphere on top of and below it in the adjacent layers. .

Back to Knowhere

page 25 of lesson

Page  26 -  Structure matters - HP packing

page 27 of lesson

 

home   sitemap   products   Polywood   .networks   contact us   Knowhere   3Doodlings