Magnetic susceptibilities of rare-earth ions in an unusual tetrahedral site.

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Magnetic susceptibilities of the series of compounds ${\mathrm{Cs}}_{2}$NaR(${\mathrm{NO}}_{2}$${)}_{6}$ have been measured for most of the rare earths (R) from Ce to Yb. These materials are cubic, with an unusual ${T}_{h}$ point symmetry at the rare-earth site. They exhibit not only many similarities but also interesting differences with the related, but octahedrally coordinated, rare-earth elpasolite halides. They are analyzed in terms of a lowest-order crystal-field theory.