Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1568867 | Journal of Nuclear Materials | 2008 | 5 Pages |
Abstract
Near infrared (4000-12 000 cmâ1) absorption spectra of Pu4+ and Np4+ dilutely incorporated in air-fired polycrystalline ThO2 were collected at ambient temperature and showed several well-defined absorption bands having widths of a few hundred cmâ1. These bands are ascribed to f-f single-ion electronic transitions and increase in intensity with Np and Pu concentration up to 0.03 formula units (f.u.). Reheating samples in H2/N2 atmosphere at 1400 °C did not produce obvious spectral change for Np-doped ThO2 and therefore no evidence of the formation of Np3+. However, the spectral lines attributed to Pu4+ decreased by approximately a factor of six in intensity, which implies reduction of Pu4+ to Pu3+.
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Authors
Yingjie Zhang, Eric R. Vance,