The incorporation of neptunium and plutonium in thorutite (ThTi₂O₆)

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• 作者：Yingjie Zhang ; Daniel J. Gregg ; Gregory R. Lumpkin ; Bruce D. Begg ; Miodrag Jovanovic
• 关键词：Neptunium ; Plutonium ; Thorutite
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：25 December, 2013
• 年：2013
• 卷：581
• 期：Complete
• 页码：665-670
• 全文大小：1482 K

文摘

The incorporation of neptunium (Np) and plutonium (Pu) into the brannerite structured lattice was studied using thorutite (ThTi₂O₆) as host lattice and sintering in air. The uncompensated Np and Pu doped samples and the low Y-charge compensated Np and Pu doped samples showed main phases as designed together with trace amounts of rutile. Those samples with larger amounts of Y produced yttrium pyrochlores as an additional minor phase. XRD analyses reveal anisotropic changes of the cell parameters; the a-parameter contracts while b- and c-parameters expand with mean cationic radius. This is in reasonable agreement with previous experimental data on ThTi₂O₆ and Ce_0.975Ti₂O_5.95. Attempts to form Np or Pu valences >4+ by adding Y as a charge compensator were unsuccessful, suggesting that tetravalent Np and Pu ions are favoured in air-fired thorutite.