Nano-structural features of barite crystals observed by electron microscopy and atom probe tomography
Nano-structural features of barite crystals observed by electron microscopy and atom probe tomography
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电子显微镜和原子探针断层扫描观察重晶石晶体的纳米结构特征
DOI：
10.1016/j.chemgeo.2016.01.018
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
D. Bosbach
中科院分区：
文献类型：
--
作者：
J. Weber;J. Barthel;F. Brandt;M. Klinkenberg;U. Breuer;M. Kruth;D. Bosbach
首次采用电子显微镜和原子探针层析成像技术对重晶石样品进行了研究，以互补的方式表征其内部微观结构。在市售的高纯度重晶石颗粒内部识别出覆盖从几纳米到几微米的尺寸范围的孔。重晶石基质似乎是单晶。观察到的多孔结构的一个特殊特征是含有大量均匀分布的纳米级孔的层系统，与含有有限数量的较大孔的层交替。高分辨率化学分析表明，孔隙中含有水和氯化钠的溶液。这些纳米级夹杂物的填充被解释为用于通过沉淀进行颗粒生长的初始过饱和溶液的残余物。这些研究结果解释了在以前的Ra吸收研究中观察到的相同类型的重晶石的高反应性，并提供进一步的影响，这些结果的解释。我们的研究结果提供了一个新的分析方法和必要的参考数据，为未来的调查在这些Ra吸收实验过程中的内部重晶石结构的变化。
For the first time a barite sample was investigated by applying electron microscopy and atom probe tomography in a complementary approach to characterize its inner microstructure. Pores covering the size range from a few nanometers to a few micrometers were identified inside particles of a commercially available high purity barite. The barite matrix appeared to be a single crystal. A particular feature of the observed porous structure is a system of layers containing a high number of homogeneously distributed nano-scale pores, alternating with layers containing a limited number of larger pores. High-resolution chemical analyses indicate that the pores contain a solution of water and sodium chloride. The filling of these nano-scale inclusions was interpreted as residua of the initial supersaturated solution used for particle growth by precipitation. These findings explain the high reactivity observed in previous Ra uptake studies on the same type of barite and provide further implications for the interpretation of these results. Our results offer a new analytical approach and necessary reference data for future investigations on changes of the internal barite structure during these Ra uptake experiments.
影响因子：
5
作者：
Geisler, Thorsten;Nagel, Thorsten;Nemchin, Alexander A.
通讯作者：
Nemchin, Alexander A.
影响因子：
5
作者：
V. Vinograd;F. Brandt;K. Rozov;M. Klinkenberg;K. Refson;B. Winkler;D. Bosbach
通讯作者：
V. Vinograd;F. Brandt;K. Rozov;M. Klinkenberg;K. Refson;B. Winkler;D. Bosbach