High-throughput, Chemical X-ray Microstructure Screening Center for Functional Glasses and Glass Ceramics

高通量功能玻璃和微晶玻璃化学X射线微结构筛选中心

• 批准号: 316987262
• 负责人: Professor Dr. Ralf B. Wehrspohn
• 金额: --
• 依托单位: Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen (IMWS)
• 依托单位国家: 德国
• 项目类别: Major Instrumentation Initiatives
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/316987262?language=en
• 关键词: throughput; Chemical; ray; Microstructure; Screening

Lab-based X-ray microscopy (XRM) has reached a level where a spatial resolution of 50 nm can be used on a routine basis. As such, it has been utilized intensely for metals and alloys. A plethora of very challenging applications of this emerging microstructure-diagnostics technique is waiting to become investigated in the realm of complex oxides. Spatial resolution is considered to be sufficient for this class of materials. The bottleneck is that 3D distributions of elements in multicomponent systems such as glass ceramics as well as new approaches to sample preparation have to become available before XRM can be widely used to explore their microstructure. In order to facilitate chemically contrasted XRM of complex oxides, the following methodological advancement of the existing XRM technique is proposed: First, ultrashort-pulsed laser ablation is used to machine perfectly cylindrical samples possessing a plate-like reference volume at its one end. After ion-beam thinning, SEM-EDXS elemental maps of this reference volume are acquired in a second step. Third, a correlation software is used to superimpose XRM and SEM-EDXS data to end up with chemical XRM data. Using this significantly improved XRM core facility, basic research regarding the crystallization in glasses and other topics of current interest for complex oxides can be studied. The latter investigations clearly do profit from a (compared to TEM) much improved volume-to-surface ratio, allowing to monitor much more representative (and thus statistically significant) sample volumes. Moreover, the temporal evolution of one and the same volume of interest upon heat treatment can be tracked and samples annealed in a temperature gradient will help enhancing throughput. Exemplified by ten case studies of high relevance for basic research, the new workflow sketched above will be proved and made available as a user facility to the German community of scientists interested in the accelerated development of complex oxides with new properties. The experimental datasets obtain will not just be used to establish microstructure-property relationships, but also form the basis for integrated computational materials engineering approaches and help building a materials data space. As such, it will become pivotal for future materials developments.

基于实验室的X射线显微镜（XRM）已经达到了可以常规使用50 nm空间分辨率的水平。因此，它已被广泛用于金属和合金。这种新兴的微结构诊断技术的大量非常具有挑战性的应用正在等待在复杂氧化物领域进行研究。空间分辨率被认为对于这类材料是足够的。瓶颈在于，在XRM可广泛用于探索其微观结构之前，必须获得多组分系统（如玻璃陶瓷）中元素的3D分布以及样品制备的新方法。为了促进化学对比XRM的复杂氧化物，现有的XRM技术的方法学进步提出：第一，超短脉冲激光烧蚀是用来机加工完美的圆柱形样品具有板状的参考体积在其一端。在离子束细化之后，在第二步骤中获取该参考体积的SEM-EDXS元素图。第三，使用相关软件对XRM和SEM-EDXS数据进行拟合，以最终得到化学XRM数据。使用这一显著改进的XRM核心设施，可以研究有关玻璃结晶的基础研究和当前感兴趣的复杂氧化物的其他主题。后者的调查显然确实受益于（与TEM相比）大大改善的体积-表面比，允许监测更具代表性（因此具有统计学意义）的样品体积。此外，可以跟踪热处理时同一个感兴趣体积的时间演变，并且在温度梯度中退火的样品将有助于提高产量。以十个与基础研究高度相关的案例研究为例，上面概述的新工作流程将得到证明，并作为一个用户设施提供给对加速开发具有新特性的复合氧化物感兴趣的德国科学家社区。获得的实验数据集不仅将用于建立微观结构-性能关系，还将为综合计算材料工程方法奠定基础，并帮助构建材料数据空间。因此，它将成为未来材料发展的关键。