Observations of the decomposition of crystals of lead iodide in the electron microscope
Observations of the decomposition of crystals of lead iodide in the electron microscope
复制标题
电子显微镜下碘化铅晶体分解的观察
DOI：
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发表时间：
1960
期刊：
影响因子：
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通讯作者：
A. J. Forty
中科院分区：
文献类型：
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作者：
A. J. Forty
摘要 已在电子显微镜中对从溶液中生长的碘化铅薄晶体进行了透射检查。晶体在电子束中足够稳定，可以观察到位错，但发现在高束强度下长时间观察后，分解开始，并经过多个阶段直至完成。初始和中间阶段伴随着先前存在的位错的攀爬、新位错的形成以及可能被解释为晶体中的空腔的其他特征的产生。这些在某种程度上可以理解为在电子束照射下晶体中形成空位的结果。在最后阶段，晶体似乎完全分解，留下密集的微晶聚集体，这些微晶可能是金属铅。这可能伴随着碘气的释放。分解最后阶段的机制尚不清楚。
Abstract Thin crystals of lead iodide grown from solution have been examined in transmission in the electron microscope. The crystals are sufficiently stable in the electron beam to allow dislocations to be observed, but it is found that after prolonged periods of observation at high beam intensities decomposition commences, and proceeds through a number of stages to completion. The initial and intermediate stages are accompanied by the climb of pre-existing dislocations, the formation of new dislocations and the creation of other features which might be interpreted as cavities in the crystal. These can be understood to some extent as a result of the formation of vacancies in the crystal under irradiation with the electron beam. In the final stage the crystals appear to decompose completely leaving an aggregate of dense crystallites which are probably metallic lead. This is presumably accompanied by the release of iodine gas. The mechanism for this final stage of decomposition is not yet understood.