X-ray diffraction study of the Y2Ti2O7 pyrochlore disordering sequence under irradiation

被引：12

作者：

Soulie, Aurelien ^{[1
,2
]}

Menut, Denis ^{[2
]}

Crocombette, Jean-Paul ^{[1
]}

Chartier, Alain ^{[3
]}

Sellami, Neila ^{[4
]}

Sattonnay, Gael ^{[5
]}

Monnet, Isabelle ^{[6
]}

Bechade, Jean-Luc ^{[1
,2
]}

机构：

[1] Univ Paris Saclay, Serv Rech Met Phys, CEA, DEN, F-91191 Gif Sur Yvette, France

[2] Univ Paris Saclay, Serv Rech Met Appl, CEA, DEN, F-91191 Gif Sur Yvette, France

[3] Univ Paris Saclay, Lab Modelisat Thermodynam & Thermochim, Serv Corros & Comportement Mat Leur Environm, CEA,DEN, F-91191 Gif Sur Yvette, France

[4] Univ Paris 11, ICMMO SP2M, Bat 410, F-91405 Orsay, France

[5] Univ Paris 11, CSNSM, CNRS, IN2P3, Bat 108, F-91405 Orsay, France

[6] Univ Caen, CNRS, CEA, CIMAP, BP 5133, F-14070 Caen 5, France

来源：

JOURNAL OF NUCLEAR MATERIALS | 2016年 / 480卷

关键词：

HEAVY-ION IRRADIATION; RADIATION TOLERANCE; INDUCED AMORPHIZATION; NUCLEAR-WASTE; RARE-EARTH; PLUTONIUM; IMMOBILIZATION; A(2)B(2)O(7); RESISTANCE; STABILITY;

D O I：

10.1016/j.jnucmat.2016.08.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The disordering sequence of Y2Ti2O7 pyrochlore, a nano-oxide phase that strengthens ODS steels under irradiation is studied in the experimental and modeling framework. XRD analysis has been performed considering both swift heavy ion and low energy/low mass ion irradiations. The simulation within molecular dynamics of Frenkel pair accumulation proves able to reproduce the variation of the amorphization fluence with temperature. XRD patterns calculated from the simulations reproduce well the patterns observed experimentally in the literature. Both experiments and calculations point to a first transition from pyrochlore to fluorite before an eventual amorphization. For swift heavy ion irradiations with 93 MeV Xe ions, tracks of direct impact amorphization are visible by HRTEM. Advanced refinement shows that one third of the pyrochlore impacted by an ion transforms into fluorite, while two third are directly amorphized. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：314 / 322

页数：9

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