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首页> 外文期刊>Journal of Crystal Growth >Optical absorption properties and valence states of uranium in CaF2 crystals grown by TGT
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Optical absorption properties and valence states of uranium in CaF2 crystals grown by TGT

机译:TGT生长的CaF2晶体中铀的光吸收性质和价态

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Calcium fluoride single crystals doped with uranyl nitrate were grown by an improved temperature gradient technique under different conditions. Absorption spectra, energy levels and unit cell parameters were studied to analyze the possible color centers and valence states of uranium ions in as-grown U:CaF2 crystals. Uranium in U:CaF2 crystals grown in the presence of PbF2 as an oxygen scavenger is trivalent. F-centers and other defects related to oxygen, with respective absorption lines at 604 and 526 nm, and impure valence states of uranium ions exist in U3+:CaF2 when the molar ratio of PbF2 to U is less than 25. In the absence of PbF2, U:CaF2 crystals are multicolor, consisting of red, cerise, yellow and green volumes from inside to outside where the red part in the core is still U3+:CaF2. Mixed valence states of uranium ions exist in the crystal. The valences of uranium ions are inferred to gradually increase from + 3 to + 6 according to the graded changes of the absorption spectra and unit cell parameters. (C) 2004 Elsevier B.V. All rights reserved.
机译:通过改进的温度梯度技术在不同条件下生长了掺有硝酸铀酰的氟化钙单晶。研究了吸收光谱,能级和晶胞参数,以分析生长的U:CaF2晶体中铀离子的可能色中心和价态。在作为氧气清除剂的PbF2存在下生长的U:CaF2晶体中的铀是三价的。当PbF2与U的摩尔比小于25时,U3 +:CaF2中的F中心和其他与氧有关的缺陷(在604和526 nm处有各自的吸收线)和铀离子的不纯价态存在于U3 +:CaF2中。 ,U:CaF2晶体是多色的,由内到外由红色,蜡红色,黄色和绿色组成,其中核中的红色部分仍为U3 +:CaF2。晶体中存在铀离子的混合价态。根据吸收光谱和晶胞参数的分级变化,推断铀离子的化合价从+ 3逐渐增加到+ 6。 (C)2004 Elsevier B.V.保留所有权利。

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