Abstract
Magnetic susceptibilities of Ce y U 1 − y O 2 solid solutions were measured from 4.2 K to room temperature. In the low range of cerium concentrations ( y), the effective magnetic moment of uranium decreased with increasing cerium concentration, but began to increase above y = 0.5. A maximum was observed at y = 0.6. After that, the moment decreased again with increasing cerium concentration. It is considered that at low cerium concentrations, a charge transfer between uranium and cerium ions occurs to some extent; U 4+ + Ce 4+ → U 5+ + Ce 3+, and at high cerium concentrations, some uranium ions are oxidized to hexavalent state, i.e. U 4+ + 2Ce 4+ → U 6+ + 2Ce 3+. Abnormal magnetic behavior was also found in the dependence of magnetic susceptibility on cerium concentration, i.e. the magnetic susceptibility of Ce 0.6U 0.4O 2 solid solution is larger than those of solid solutions with y ⩾ 0.7 and y ⩽ 0.5.
Published Version
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