Role of irradiation spectrum in the microstructural evolution of magnesium aluminate spinel
Role of irradiation spectrum in the microstructural evolution of magnesium aluminate spinel
复制标题
辐照光谱在铝酸镁尖晶石微观结构演化中的作用
DOI：
10.1080/01418619808241924
复制
发表时间：
1998
影响因子：
1.6
通讯作者：
H. Abe
中科院分区：
文献类型：
--
作者：
K. Yasuda;C. Kinoshita;R. Morisaki;H. Abe
摘要在透射电子显微镜-加速器装置上，采用离子和电子同时辐照的方法，对MgAl_2 O_4中缺陷团簇的成核和生长进行了原位观察，以深入了解辐照谱的作用。各种30或300 keV的离子（He+，O+，Mg+，Ar+和Ar+）和200 keV或1 MeV的电子被用来提供广泛的核和电离阻止功率以及各种效应的位移级联。在870 K下，用30 keV离子和1 MeV电子同时辐照，在电子束内外均形成位错环。我们观察到的各种微结构，形成在同时照射300 keV的离子和200 keV的电子。这些措施包括优先形成的空腔，抑制位错环的形成和优先形成的环在周围的聚焦电子束。本文从电离、位移和辐射的角度讨论了辐射光谱效应。
Abstract In-situ observations of the nucleation and growth of defect clusters in MgAl2O4 were made in transmission electron microscope-accelerator facilities using concurrent irradiation with ions and electrons to obtain insight into the role of the irradiation spectrum. Various kinds of 30 or 300 keV ions (He+, O+, Mg+, Ar+ and Xe+) and 200 keV or 1 MeV electrons were used to provide a wide range of nuclear and ionizing stopping powers as well as a various effects of displacement cascades. Dislocation loops were formed both inside and outside the electron beam at 870 K under concurrent irradiation with 30keV ions and 1 MeV electrons. We observed a variety of microstructures that formed during concurrent irradiation with 300 keV ions and 200 keV electrons. These include preferential formation of cavities, suppression of dislocation loop formation and preferential formation of loops at the periphery of the focused electron beam. We discuss the irradiation spectrum effects in terms of the ionizing, displaci...