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
boundary p p p
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.