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Ch 12 pt 2 - IMPORTANT SLIDE O T CN for cations 4 for...

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Chapter 12 - 8 In FCC unit cell there are 4 atoms, so it follows that: in a unit cell the number of octahedral sites = number of atoms AND the number of tetrahedral sites = 2 x number of atoms IMPORTANT SLIDE Octahedral sites are larger CN for cations : ± 4 for tetrahedral ± 6 for octahedral T RED = Octahedral sites = 1/4 x 12 + 1 = 4 per unit cell BLUE = Tetradedral sties = 8 per unit cell O sites
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