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Supercell building with Avogadro-1.1.1


#1

Problem in supercell building of Quartz {001} ?

I have downloaded cif file from the below link but now I am confused in the cif files because the atoms are overlapping when I am generating supercell. Supercell of 2 times in each direction by using Avogadro. Actual number of atoms are 72 in supercell but in Avogadro it is showing 80 atoms.

http://materials.springer.com/isp/crystallographic/docs/sd_0541887

Thanks in advance.