High temperature susceptibility and fractional valence of some Ce-intermetallics

The magnetic susceptibility of eight Ce-intermetallic compounds and two concentrated alloys was measured together with that of isostructural reference compounds between 1.5 and 1200 K. The high temperature susceptibility gives a lower bound of 0.3 for the 4? occupation number, supporting L_III evidence that Ce is never tetravalent in intermetallics.