ABINIT Discussion Forums

I've been running several simulations on barium titanate and comparing energy for different atomic coordinate positions near equilibrium. The equilbrium lattice constants look reasonable as well as the qualitative trend of the energy as the atomic coordinates change. BUT, I find that the total energy is exactly the same if I use one or two unit cells given the same lattice spacing and doubled acell size. Since the units of energy are Hartree (instead of Hartree/volume), I don't understand why the total energy is independent of the number of unit cells.

Does anyone know if and how Abinit normalizes the energy?

Thanks,
Billy

Could you please attach your input files, and tell me the pseudopotentials you are using.
I may understand your problem better if I could run the files & see the outputs.