If silcion is cooled quickly it will form glass instead of crystallyzing,one way to do this is to deposit Si atoms onto cold substrate with H added to remove defects, these thin films of amorphous (Si with H are used for sola cells)
1-Make a schematic drawing of amorphous Si glass with 10% H including about 30 atoms(Hint think about how many bonds Si will form and how many bonds will H form)
2-If H content was increased to 20%, what effect of this will have on fracture toughness of the material?