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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >IN SITU STUDIES OF ION IRRADIATED ZIRCONOLITE, PYROCHLORE AND PEROVSKITE
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IN SITU STUDIES OF ION IRRADIATED ZIRCONOLITE, PYROCHLORE AND PEROVSKITE

机译：离子辐照锆石，焦绿石和钙钛矿的原位研究

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The relative radiation resistance of the structures of zirconolite, pyrochlore and perovksite wore investigated by in situ transmission electron microscopy using 1.5 MeV Kr+ ions in the HVEM-Tandem User Facility, at Argonne National Laboratory. A suite of six fabricated zirconolites, one fabricated pyrochlore and one natural perovskite was used. Damage accumulation essentially occurs in the same way in all three phases and is revealed by the following changes in SAD patterns: weakening of superlattice Bragg diffraction maxima, appearance of diffuse rings which increase in intensity with dose, disappearance of superlattice or other specific classes of maxima, and disappearance of remaining sublattice maxima leaving only diffuse rings. The average critical doses for amorphisation (D-c) for all the zirconolites (undoped, Nd-doped, U-doped and Th-doped) and the pyrochlore in this study varied by a factor of similar to 2 (from 3.5 to 6.1 X 10(18) ions m(-2)). No correlations were observed between D-c and the atomic weight of dopants in zirconolite or the mean atomic weight of the sample. The D-c value at room temperature of perovskite was found to be 1.8 X 10(19) ions m(-2), 3-5 times the D-c values for zirconolite. This observation is in line with what one expects from the topologic and chemical complexity of the two phases and is compared with the results of previous authors. Preliminary assessment was made of EELS as a tool for monitoring radiation damage. (C) 1997 Elsevier Science B.V. [References: 52]
机译：在Argem国家实验室的HVEM串联用户设施中使用1.5 MeV Kr +离子通过原位透射电子显微镜对锆石，烧绿石和perovksite的结构的相对辐射电阻进行了研究。使用了一套六种人造锆石，一种烧绿石和一种天然钙钛矿。损伤累积基本上在所有三个阶段中都以相同的方式发生，并且通过以下SAD模式变化得以揭示：超晶格布拉格衍射最大值的减弱，弥散环的出现随着剂量的增加强度增加，超晶格的消失或其他特定类别的最大值，以及剩余的子晶格最大值消失，仅留下扩散环。本研究中所有锆石（未掺杂，Nd掺杂，U掺杂和Th掺杂）和烧绿石的非晶化的平均临界剂量（Dc）相差约2倍（从3.5到6.1 X 10（ 18）离子m（-2））。 D-c与锆石中掺杂物的原子量或样品的平均原子量之间没有相关性。发现钙钛矿在室温下的D-c值为1.8 X 10（19）离子m（-2），是锆钛矿D-c值的3-5倍。这一观察结果与人们对这两个阶段的拓扑和化学复杂性的期望相符，并且与先前的作者的结果进行了比较。初步评估了EELS作为监测辐射损伤的工具。 （C）1997 Elsevier Science B.V. [参考：52]

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