B4Tb
Elf, F.Pfeiffer, F.Schaefer, W.Etourneau, J.Will, G.
Journal of the Less-Common Metals (1981) 82, 349-355
a=7.12Å b=7.12Å c=4.042Å
α=90° β=90° γ=90°
B4Er
Will, G.Schaefer, W.Pfeiffer, F.Elf, F.Etourneau, J.
a=7.071Å b=7.071Å c=4Å
Georges, R.Schaefer, W.Pfeiffer, F.Will, G.Etourneau, J.
Revue de Chimie Minerale (1980) 17, 533-539
a=7.0705Å b=7.0705Å c=4Å