[lammps-users] how to define the tersoff potential of SIO2

hi :

i wrote a tersoff potential file for SIO2 in the same format as SiC,(two elements and 8 items ),and in the file i define
units metal
atom_style atomic
boundary p p p
read_data data.4500
timestep 0.001
pair_style tersoff
pair_coeff * * SiO22.tersoff O Si
However,after i minimize the systerm and see the dump file in vmd,all atoms are white ,and as long as i run the systerm for some time,the systerm collapse,i think it’s probably the potential problerm. i try to wrote three elements(O Si O)in the potential file ,but failed .could someone can help me? thank you very much.

There are several tersoff files in the potentials dir for binary systems.
And the instructions on the tersoff doc page (pair_tersoff.html) are
very detailed, as to the format of the file. SiO2 is not a system
with 3 elements, there are only 2: Si and O. Thus your potential
file should only have 2 elements, like the other binary ones that
are there.