کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1568867 | 1514250 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diffuse reflectance spectroscopy of tetravalent neptunium and plutonium ions in ThO2
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
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![عکس صفحه اول مقاله: Diffuse reflectance spectroscopy of tetravalent neptunium and plutonium ions in ThO2 Diffuse reflectance spectroscopy of tetravalent neptunium and plutonium ions in ThO2](/preview/png/1568867.png)
چکیده انگلیسی
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+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 374, Issues 1â2, 29 February 2008, Pages 192-196
Journal: Journal of Nuclear Materials - Volume 374, Issues 1â2, 29 February 2008, Pages 192-196
نویسندگان
Yingjie Zhang, Eric R. Vance,