Lr. Corruccini et al., MAGNETIC-PROPERTIES OF THE RPO4(MOO3)(12)X30H(2)O COMPOUNDS, R = CE, PR, ND, TB, HO, TM, AND YB, Physica. B, Condensed matter, 240(1-2), 1997, pp. 43-48
Magnetic susceptibilities of a number of the rare earth (R) phosphomol
ybdates, RPO4(MoO3)(12) x 30H(2)O, have been measured from 300 K down
to similar to 10 mK. These materials are cubic, with space group Fd(3)
over bar, and are characterized by weak crystalline field splittings.
Most can be explained in terms of a lowest order theory for a crystal
field with T-d(<(4)over bar 3m>) symmetry, but those of Tb, Ho, and T
m disagree. The discrepancy appears to be due to disorder in the posit
ion of the cations about the 8 a sites.