Muddiest Points – Unit Cell

Muddiest Point 1: “Figuring how to find the properties of atoms (FD,BD,APF etc) Just a lot if info at once.”

Muddiest Point 2: “I am very confused on the last activity. I have no idea what just happened.”

Muddiest Point 3: “The calculations related to unit cells, APF,F a/e/ length etc.”

Features of FCC

# atoms faces, corners = # atoms / UC =

# =____ ____ At / UC__________

Atoms touch along direction? ______________

# atomic radii along touch direction within UC? # R = ______

Cube edge (lattice constant) ao = f (R) a = _________

Length FD = f (R) FD = _______

Length BD = f (R) BD = _______

Cube volume V = f(R) V / UC = ________

Atomic Packing Factor = Vol atoms / Vol UC APF =______

Coordination Number = # of atoms touching one atom CN =_______

#corner  atoms?  

#face  atoms?  

#  body  atoms?  

 

Atoms  touch  along    direc7on?  

Real  Gold  

2

Atomic  Packing  Factor  (APF)  

APF  =  (vol  atoms/UC)  /  (vol  UC)  

Crystal Spatial Visualization Survey

ClassID#:

PLEASE COMPLETE OTHER SIDE ALSO

Finding  a  (Unit  Cell  Edge)  in  terms  of  R  

Finding  the  Body  Diagonal  in  terms  of  R