Face Centred Cubic (FCC) Unit Cell


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MATTER LogoIntroduction to Point Defects

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Vacancies > Number of Nearest Neighbours in 3D Crystals

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This animation is an image showing the completed layers from the previous two exercises.

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OK, these are the first three planes of an FCC crystal.

Click here to see an FCC unit cell.

How many nearest neighbours does the central green atom have:

3, 6, 9, 12, 15 or 18?

No. Each atom in an FCC crystal has 12 nearest neighbours: 6 on the same close-packed {111} plane and 3 on each adjacent {111} planes.

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Yes. Each atom in an FCC crystal has 12 nearest neighbours: 6 on the same close-packed {111} plane and 3 on each adjacent {111} planes.

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