Ion-irradiation-induced amorphization of La2Zr2O7 pyrochlore -: art. no. 054108
Ion-irradiation-induced amorphization of La2Zr2O7 pyrochlore -: art. no. 054108
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DOI：
10.1103/physrevb.66.054108
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发表时间：
2002-08-01
影响因子：
3.7
通讯作者：
Ewing, RC
中科院分区：
文献类型：
--
作者：
Lian, J;Zu, XT;Ewing, RC
等轴焦绿石结构A(2)B(2)O(7)一般对辐射损伤敏感，但某些成分具有显著的抗辐射损伤能力。在二元系统Gd-2(Ti2-xZrx)O-7中，随着Ti的取代，辐射抗性急剧增加，直到纯的端元Gd2Zr2O7不能非晶化，即使在类似100dpa的剂量下也是如此。虽然锆酸盐烧绿石通常被认为是抗辐射的，但我们报告了用离子束辐照(类似于室温下的5.5 dpa)使锆酸盐焦绿石La2Zr2O7非晶化的结果。非晶化临界温度T-c较低，接近310K。锆石的离子束诱导非晶化和结构无序的敏感性与结构偏离理想萤石结构有关，如O-48F的x参数所反映的那样。
The isometric pyrochlore structure, A(2)B(2)O(7), is generally susceptible to radiation damage, but certain compositions are remarkably resistant to radiation damage. In the binary system Gd-2(Ti2-xZrx)O-7, the radiation resistance increases dramatically with the substitution of Zr for Ti, until the pure end member Gd2Zr2O7 cannot be amorphized, even at doses as high as similar to100 dpa. Although zirconate pyrochlores are generally considered to be radiation resistant, we report results for the amorphization of a zirconate pyrochlore La2Zr2O7 by ion beam irradiation (similar to5.5 dpa at room temperature). The critical amorphization temperature T-c is low, similar to310 K. The susceptibility to ion-beam-induced amorphization and structural disordering for zirconate pyrochlores is related to the structural deviation from the ideal fluorite structure, as reflected by the x parameter of the O-48f.