Paramagnetic defects induced by electron irradiation in barium hollandite ceramics for caesium storage

被引：17

作者：

Aubin-Chevaldonnet, V.

Gourier, D.

Caurant, D.

Esnouf, S.

Charpentier, T.

Costantini, J. M.

机构：

[1] Ecole Natl Super Chim Paris, CNRS, UMR 7574, Lab Chim Mat Condensee Paris, F-75231 Paris 05, France

[2] Ecole Polytech, F-91128 Palaiseau, France

[3] Commissariat Energie Atom, CEA, DSM, DRECAM,Lab Solides Irradies, F-91128 Palaiseau, France

[4] Commissariat Energie Atom, CEA, DSM,CNRS,URA 331, DRECAM,SCM, F-91191 Gif Sur Yvette, France

[5] Commissariat Energie Atom, CEA, DEN, DMN,Serv Rech Met Appliquee, F-91191 Gif Sur Yvette, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2006年 / 18卷 / 16期

关键词：

D O I：

10.1088/0953-8984/18/16/009

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied by electron paramagnetic resonance the mechanism of defect production by electron irradiation in barium hollandite, a material used for immobilization of radioactive caesium. The irradiation conditions were the closest possible to those occurring in Cs storage waste forms. Three paramagnetic defects were observed, independently of the irradiation conditions. A hole centre (H centre) is attributed to a superoxide ion O-2(-) originating from hole trapping by interstitial oxygen produced by electron irradiation. An electron centre (Et centre) is attributed to a Ti3+ ion adjacent to the resulting oxygen vacancy. Another electron centre (E-2 centre) is attributed to a Ti3+ ion in a cation site adjacent to an extra Ba2+ ion in a neighbouring tunnel, originating from barium displacement by elastic collisions. Comparison of the effects of external irradiations by electrons with the beta-decay of Cs in storage waste forms is discussed. It is concluded that the latter would be dominated by E-1 and H centres rather than E-2 centres.

引用

页码：4007 / 4027

页数：21

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