# Question in material structure.

by M.masarwy
Tags: material, structure
 P: 2 This is my solve I) for BCC :- assumming 2 unitcells : a= ( 4r )\$$\sqrt{}3$$ =2.86 A a) for the plane ( 0 1 0 ) ( the plane between the 2 cubics ) the free lenght between each 2 oppiste atoms = a$$\sqrt{}2$$ - 2r = 1.56 A b) the free length between the 2 central atoms = a - 2r = 0.38 A from a , b the largest radius = 0.38 A II) for FCC : assumming unitcell : a = 2a $$\sqrt{}2$$ =3.507 A the free space between each 2 oppiste face central atoms = a - 2r = 1.0272 A the largest radius = 1.0272 A III) If I have carbon with r = 0.77 A it's possible to occur as an intastitial in a FCC May I have ur comments ??!!