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Ulumab

- 1

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## Homework Statement

Calculate the surface density (planar density) of the Silicon diamond structure in the [1 0 0],[1 1 0],[1 1 1] planes.

Given a = 5.431 A (latice constant)

Hint: For the (111) plane, it should help you to think of the diamond lattice as two interpenetrating FCC lattices.

**2. The attempt at a solution**

I managed to solve [1 0 0] and [1 1 0](2/a^2 and 4/sqrt(2)*a^2) I have also got a result for [1 1 1](2/(sqrt(3)/2*a^2)) but I completely ignored the hint in the description.