Multiple potential

LAMMPS LAMMPS Beginners
1

Hello!
I have 3 potentials InAlN, AlGaN and InGaN. I would like to use InAlN to describe the In Al interaction, AlGaN for Al Ga and other interactions by InGaN. how can we do this on lammps? I used this command but i have an error :incorrect args for pair coefficients
pair_style sw
pair_coeff 1 2 InGaN.sw N Ga In
pair_coeff 1 3 InGaN.sw N Ga In
pair_coeff 2 3 InGaN.sw N Ga In
pair_coeff 1 1 InGaN.sw N Ga In
pair_coeff 2 2 InGaN.sw N Ga In
pair_coeff 3 3 InGaN.sw N Ga In

pair_coeff 2 4 GaNAl.sw N Ga Al
pair_coeff 1 4 GaNAl.sw N Ga Al
pair_coeff 3 4 InNAl.sw N Ga Al
Best regard

2

You cannot. This violates the syntax rules for pair style sw and for a good reason, since this is not a pairwise additive potential, so you cannot partition its parameter files into pairwise subsets. You need one parameter file for all elements and all permutation of pairs of atom types and triplets of atom types.

3

Thank you for your reply!