An element crystallises in `f.c.c.` lattice having edge length `400 p m`. Calculate the maximum diameter, which can be placed in interstitial sites without disturbing the structure.

An element crystallises in `f.c.c.` lattice having edge length `400 p

1.	An element crystallises in `f.c.c.` lattice having edge length `400 p m`. Calculate the maximum diameter, which can be placed in interstitial sites without disturbing the structure.
Answer» For a fcc structure, edge length (a) is related to the radius (r) `r=(a)/(2sqrt2)=((400"pm")/(2sqrt2))=141.42"pm"` In octahedral (fcc) void R = 0.414 r `=0.414xx141.42` Diameter `=2R=2xx0.414xx141.42=117.096"pm."`

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An element crystallises in `f.c.c.` lattice having edge length `400 p m`. Calculate the maximum diameter, which can be placed in interstitial sites without disturbing the structure.

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