B2Gd
Hall, H.T.Cannon, J.F.Cannon, D.M.
Journal of the Less-Common Metals (1977) 56, 83-90
a=3.315Å b=3.315Å c=3.936Å
α=90° β=90° γ=120°
B2Sm
a=3.31Å b=3.31Å c=4.019Å