Se2Ta
Huisman, R.Jellinek, F.
Journal of the Less-Common Metals (1969) 17, 111-117
a=3.436Å b=3.436Å c=25.532Å
α=90° β=90° γ=120°
Nb2Se3
Kadijk, F.Huisman, R.Jellinek, F.
Acta Crystallographica B (24,1968-38,1982) (1968) 24, 1102-1106
a=6.503Å b=3.434Å c=9.215Å
α=90° β=103.39° γ=90°