ETCHING OF RADIATION DAMAGE IN LITHIUM FLUORIDE
ETCHING OF RADIATION DAMAGE IN LITHIUM FLUORIDE
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DOI：
10.1038/182375a0
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发表时间：
1958-01-01
期刊：
影响因子：
64.8
通讯作者：
YOUNG, DA
中科院分区：
文献类型：
--
作者：
YOUNG, DA
对氯化钾中裂变碎片被允许反冲到晶体中引起的显色进行ROM实验，提出了未退火的反冲轨迹由单个和聚集的晶格缺陷组成，并捕获了正空穴和电子。在f波段的光学漂白过程中，f和电子过剩中心聚集形成R ‘ ’中心，沿着反冲碎片产生的损伤的核心，并且表明在化学性质方面，即沉淀，反冲轨迹类似于严重的慢跑位错。离子晶体中由来自外部源的裂变碎片反冲而产生的损伤现在已经用另一种技术进行了检验。有人认为，在注入裂变碎片的表面周围，晶体的热力学势应该增加，这应该表现在相对于未损坏的晶体表面的溶解速度加快。这就是说，蚀坑应该在位错处形成。因此，氟化锂的单晶沿着100)平面被切割，来自1毫米远的u - o膜的裂变碎片允许在室温下进入晶体表面的一部分。然后将晶体在浓氢氟酸（1份）和含氟化铁的冰醋酸（1份）的混合物中蚀刻，这是Gilman和Johnstone推荐的。在12℃下无搅拌蚀刻1 - 42分钟后，结晶在无水酒精和干醚中洗涤，在暖空气中干燥，并在维氏投影显微镜倾斜照明下拍照。
ROM experiments on the coloration induced in potassium chloride by fission fragments allowed to recoil into the crystal, it was proposedº that the unannealed recoil tracks consist of individual and aggregated lattice defects with trapped positive holes and electrons. During optical bleaching of the F-band, the F-and electron-excess centres aggregate to form R “-centres along the core of the damage produced by the recoiling fragment, and it was suggested that in respect of chemical properties, that is, precipitation, the recoil track is similar to a heavily jogged dis-location.The damage produced in ionic crystals by recoiling fission fragments from an external source has now been examined by another technique. It was argued that the thermodynamic potential of the crystal should be increased around those regions of the surface at which the fission fragments are injected, and that this should manifest itself in an enhanced rate of dissolution with respect to the undamaged crystal surface. That is to say, etch-pits should be formed as at dislocations. Accordingly, single crystals of lithium fluoride were cleaved along the 100) plane and fission fragments from a U. O-film 1 mm. distant allowed to enter a portion of the crystal surface at room temperature. The crystals were then etched in the mixture of concentrated hydrofluoric acid (1 part) and glacial acetic acid (1 part) saturated with ferric fluoride, which was recommended for the purpose by Gilman and Johnstone". After etching without agitation for between 1 and 42 min. at 12 C., the erystals were washed in absolute alcohol and dry ether, dried in a warm air current and photographed under oblique illumination in a Vickers projection microscope.