A nicely formatted ternary diagram can be found here in
PNG or PDF
format. The extensions "NCNN", etc. in the al-co-ni ternary
mC26 structures refer to the distribution of Co and Ni atoms
on the four TM(1) sites.
VASP setup :
PTYPE=paw_GGA
VASP potential specification :
BINARY SYSTEMS:
al-co
al-ni
co-ni
TERNARY SYSTEMS:
al-co-ni