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Synthesis of neptunyl(VI) hydroxides and their237Np Mössbauer spectra

  • Materials Science: Mössbauer Spectrometry
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Abstract

Four types of neptunyl(VI) hydroxides have been synthesized by chemical oxidation of Np(IV) instead of ozone oxidation of Np(V) which caused the partial oxidation to the heptavalent state. NpO2(OH)2 (I) and NpO2(OH)2·H2O (orthorhombic type) (II) have been obtained by adding pyridine to the solution at 373K and 343K, respectively. NpO2(OH)2·H2O (hexagonal type) (III) and NpO2(OH)2·xH2O·yNH3 (x+y=1) (IV) have been prepared by using LiOH and NH4OH, respectively. The four materials have been characterized by X-ray powder diffraction patterns, thermogravimetric analysis and237Np Mössbauer spectra. The237Np Mössbauer spectrum of (I) measured first time as anhydrous neptunyl(VI) hydroxide (δ=−46.2 mm/s,e 2 qQ=193 mm/s and η=0.16 at 4.8K) has more distinct five-line Mössbauer pattern than those of (II), (III) and (IV). The Mössbauer spectra for (II), (III) and (IV) are slightly different from each other. The structural information has been obtained from these data.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Toho University, 274, Funabashi, Chiba, Japan

    T. Saito, J. Wang, T. Kitazawa, M. Takahashi & M. Takeda

  2. Advanced Science Research Center, Atomic Energy Research Institute, Tokai, 319-11, Ibaraki, Japan

    M. Nakada, T. Nakamoto, N. M. Masaki, T. Yamashita & M. Saeki

Authors
  1. T. Saito
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  2. J. Wang
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  3. T. Kitazawa
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  4. M. Takahashi
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  5. M. Takeda
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  6. M. Nakada
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  7. T. Nakamoto
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  8. N. M. Masaki
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  9. T. Yamashita
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  10. M. Saeki
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Saito, T., Wang, J., Kitazawa, T. et al. Synthesis of neptunyl(VI) hydroxides and their237Np Mössbauer spectra. J Radioanal Nucl Chem 239, 319–323 (1999). https://doi.org/10.1007/BF02349504

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  • DOI: https://doi.org/10.1007/BF02349504

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