- Cubic aluminum silicides RE8Ru12Al49Si9(Al(x)Si12-x) (RE = Pr, Sm) from liquid aluminum. Empty (Si,Al)12 cuboctahedral clusters and assignment of the Al/Si distribution with neutron diffraction. Sieve, B., Chen, X.Z., Henning, R., Brazis, P., Kannewurf, C.R., Cowen, J.A., Schultz, A.J., Kanatzidis, M.G. J. Am. Chem. Soc. (2001)