 |
Silicon Chunk Source: Larger Boule, Found Purity: >99.99% Silicon makes the most beautiful fracture surfaces. The pictures speak for themselves. |
   |
Silicon Polycrystalline Sample Source: Found, Fleming Lab Cleanout Purity: >99.999% This si a good example of a large-grained polycrystalline sample of highly pure silicon. The flat face has crystals clearly visible, while the fracture surfaces retain the shininess and fractal-fracture surfaces we all know and love. |
   |
Silicon Single Crystal Sample Source: Larger Boule, Found Purity: Likely 99.9999% This piece of Silicon has a few perfectly round faces, suggesting that it's a piece of a larger cylinder, or boule, grown by the standard screw dislocation process. I believe the colinear bands on the surfaces are shear bands due to deformation of the crystal (probably during fracture), but I could be wrong. Hooray for passivation! Hooray for Silicon! |