VIBRATING SAMPLE HOLDER FOR XRD ANALYSIS WITH MINIMAL SAMPLE PREPARATION
VIBRATING SAMPLE HOLDER FOR XRD ANALYSIS WITH MINIMAL SAMPLE PREPARATION
复制标题
用于 XRD 分析的振动样品架，只需最少的样品制备
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
D. Vaniman
中科院分区：
文献类型：
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作者：
P. Sarrazin;S. Chipera;D. Bish;D. Blake;D. Vaniman
提出了一种新的粉末x射线衍射分析样品处理方法，可以对制备不良的样品进行表征。该技术依靠在样品支架中产生的振动来在样品支架本身没有宏观运动的情况下产生粉末样品的运动。与传统样品处理策略相比，主要优点是：1)能够表征比以前可能的大两个数量级的颗粒尺寸的材料，而不会导致数据退化；2)易于装载和移除样品，不需要复杂的机构。振动样品夹技术在实验室XRD仪器以及NASA用于机器人行星探测的微型XRD/XRF仪器中进行了演示。观察到粗粒度材料的数据质量有显着改善，为此类材料产生准确和可重复的强度数据。振动样品夹将在CheMin中实现，CheMin是一种XRD/XRF仪器，将包括在NASA的火星2009年火星科学实验室任务中。在火星上的两年部署期间，MSL ' 09探测车将对火星表面进行有机、化学和矿物学分析。CheMin将对船上的碎石机输送的粉末进行定量矿物学分析，无需进一步研磨。振动样品夹技术将广泛适用于遇到困难样品的应用，例如：非常少量的材料，接收或磨削不耐受的材料，过程控制，远程现场分析等。
A new approach to sample handling for powder X-ray diffraction analysis is presented that allows characterization of poorly prepared samples. The technique relies on vibrations generated in a sample holder to create movement of the powdered sample in the absence of macroscopic movement of the sample holder itself. The major benefits over conventional sample handling strategies are: 1) the ability to characterize materials with grain sizes up to two orders of magnitude larger than previously possible without degradation of the data; and 2) ease of loading and removal of the samples, with no requirement for complex mechanisms. The Vibrating Sample Holder technique was demonstrated in a laboratory XRD instrument as well as in a miniature XRD/XRF instrument intended for robotic planetary exploration by NASA. A dramatic improvement in data quality for coarse-grained materials was observed, yielding accurate and reproducible intensity data for such materials. The Vibrating Sample Holder will be implemented in CheMin, an XRD/XRF instrument that will be included in NASA’s Mars 2009 Mars Science Laboratory mission. During its 2-year deployment on Mars, the MSL ’09 rover will conduct organic, chemical and mineralogical analyses of the Mars surface. CheMin will perform quantitative mineralogical analyses of powders delivered by an on-board rockcrusher, with no need for further grinding. The vibrating sample holder technique will be useful for a wide range of applications in which difficult samples are encountered, such as: very small amounts of material, as-received or grinding-intolerant material, process control, remote field analysis, etc.