The incorporation of plutonium and neptunium in zirconolite and perovskite

被引：85

作者：

Begg, BD

Vance, ER

Conradson, SD

机构：

[1] Australian Nucl Sci & Technol Org, Div Mat, Menai, NSW 2234, Australia

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1998年 / 271卷

关键词：

plutonium; neptunium; zirconolite; perovskite; Synroc; immobilisation;

D O I：

10.1016/S0925-8388(98)00058-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The incorporation of Pu and Np in one zirconolite and a number of perovskite formulations has been investigated under oxidising and reducing conditions. The Pu valence in both perovskite and zirconolite was found to vary independently of the crystal chemical design by altering the annealing atmosphere, from Pu(4+) in air to Pu(3+) in 3.5% H(2)/N(2). For both atmospheres, only tetravalent Np was found in the zirconolite. Tetravalent Np was observed in perovskites fired in air, but trivalent Np was stabilised in suitable perovskite formulations annealed under a reducing atmosphere. A trivalent Np phosphate, NpPO(4), was also prepared under reducing conditions. (C) 1998 Elsevier Science S.A.

引用

页码：221 / 226

页数：6