Preparation and characterization of synthetic Th0.5U0.5SiO4 uranothorite

被引：26

作者：

Costin, D. T. ^{[1
]}

Mesbah, A. ^{[1
]}

Clavier, N. ^{[1
]}

Szenknect, S. ^{[1
]}

Dacheux, N. ^{[1
]}

Poinssot, C. ^{[2
]}

Ravaux, J. ^{[1
]}

Brau, H. P. ^{[1
]}

机构：

[1] ICSM, UMR 5257 CEA CNRS UM2 ENSCM, F-30207 Bagnols Sur Ceze, France

[2] CEA DEN DRCP DIR, F-30207 Bagnols Sur Ceze, France

来源：

PROGRESS IN NUCLEAR ENERGY | 2012年 / 57卷

关键词：

Uranothorite; Uranium; Thorium; Silicate; Hydrothermal synthesis; Raman; SOLID-SOLUTIONS; RAMAN-SPECTRA; ZIRCON ZRSIO4; X-RAY; HYDROTHERMAL SYNTHESIS; CRYSTAL-STRUCTURES; THSIO4; POLYMORPHS; OPTICAL-SPECTRA; SINGLE-CRYSTAL; THORITE;

D O I：

10.1016/j.pnucene.2011.10.004

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The preparation of a synthetic uranothorite with desired formula Th0.5U0.5SiO4 was performed under hydrothermal conditions from a mixture of tetravalent thorium and uranium in hydrochloric solution with sodium metasilicate. The XRD rietveld analysis revealed that the system obtained was composed by two crystallized phases. The first one corresponded to uranium-depleted Th0.57U0.43SiO4 with a = 7.0571(1) angstrom and c = 6.2998(1) angstrom that confirmed the formation of a solid solution between thorite and coffinite end-members. On the other hand, U-enriched Th0.21U0.79O2 dioxide was also pointed out while the formation of amorphous SiO2 was stated from elementary analyses and mu-Raman spectroscopy. This latter also led to confirm the formulation of the silicate by rejecting unambiguously the presence of structural hydroxyl groups or water molecules. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：155 / 160

页数：6

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