Register to reply

Crystal structure wurtzite

by aaaa202
Tags: crystal, structure, wurtzite
Share this thread:
aaaa202
#1
Dec19-13, 10:10 AM
P: 1,005
As far as I understand wurtzite is the name given to the crystal structure defined by the stacking sequence ABABABAB..
However, I am having a hard time understanding what the unit cell is of wurtzite. From what I know the unit cell is the smallest repetitive unit and in it you specify the position of the different atoms. So I looked up something about wurtzite and found that data:
http://som.web.cmu.edu/structures/S014-ZnO.html
And according to this you only need to specify the position of two atoms, while the unit cells seems to encapsulate a lot more atoms - why are the positions of these not specified?
And another question: The meaning of the coordinates (x,y,z) is x*a1,y*a2,z*a3, where a1,a2,a3 are the unit vectors of the hexagonal lattice - right?
Thanks for taking your time
Phys.Org News Partner Chemistry news on Phys.org
Scientists make diseased cells synthesize their own drug
Biochemists find new treatment options for staph infections, inflammatory diseases
New synthesis method may shape future of nanostructures, clean energy
Alkim
#2
Jan10-14, 01:20 PM
P: 98
The answer is easy. Two atoms do not form a cell but what is called an asymmetric unit: http://en.wikipedia.org/wiki/Crystal...ture#Unit_cell
The unit cell is obtained from the asymmetric unit by applying symmetrical operations.


Register to reply

Related Discussions
Wurtzite crystal structure Atomic, Solid State, Comp. Physics 1
Cscl crystal structure Atomic, Solid State, Comp. Physics 5
HCP Crystal Structure Atomic, Solid State, Comp. Physics 2
Crystal Structure Materials & Chemical Engineering 4
Crystal's structure Atomic, Solid State, Comp. Physics 2