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Two cubic lattice structures are shown below. The first is simple cubic one, which is unstable for the most of potentials. The second is FCC (face centred close packed) cubic structure, which has much higher density then the simple one.
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FCC crystal preserving the shape of the elementary cell is shown in the first picture below. The second picture shows the same crystal, but with the smaller atom radii, so as the inner structure is better visible. The third picture is junction of two FCC structures.
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Designed by Julia Asaturova
