World 1 · Atoms in a repeating cell · 8 minSix shared faces
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A face-centred cubic cell has eight corners and six face centres. A face belongs to two cells, so the count is 8 × ⅛ + 6 × ½ = 4. Contact is along a face diagonal: 4r = √2 a.
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How much of a face-centre atom belongs to one cell?
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