Dear Friends,I have a rhombohedral unit cell of ten atoms (two molecules per
cell). I want to form a supercell of this structure having 40 atoms, but its
sides are not be parallel to the lattice vectors of original unit cell. My
first impression is that I can't use the original lattice parameters for
optimizing this supercell, as I saw in many QE examples, please correct me if I
am wrong. I can think of two possibilities - 1. Considering this unit of
40 atoms being in a triclinic unit cell (ibrav = 14) could be a option, and I
can use positions of the atoms in Angstroms. Though I will surely loose the
opportunity to set the space group if I use this method.2. If I give the space
group and lattice parameters of 40 atom supercell (without mentioning ibrav)
with the positions of atoms in angstroms/crystal_sg, will this work ?Please
suggest me which of them makes more sense, and if there could be a better
alternative to both of them ? ThanksAmar 
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