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首页> 外文期刊>Clays and clay minerals >PREFERRED ORIENTATION OF MINERAL GRAINS IN SAMPLE MOUNTS FOR QUANTITATIVE XRD MEASUREMENTS: HOW RANDOM ARE POWDER SAMPLES?
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PREFERRED ORIENTATION OF MINERAL GRAINS IN SAMPLE MOUNTS FOR QUANTITATIVE XRD MEASUREMENTS: HOW RANDOM ARE POWDER SAMPLES?

机译：用于定量XRD测量的样品安装中矿粒的首选方向：粉末样品如何随机？

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摘要

The degree of preferred orientation of mineral grains in powder X-ray diffraction (XRD) samples prepared by standard techniques has been evaluated by means of a correction model implemented in the Rietveld program, BGMN. It is demonstrated that neither front- nor side-loading of mineral powders obtained by wet grinding in a McCrone micronizing mill yield powder mounts with randomly oriented particles. Despite fine grinding, the primary sizes and shapes of mineral grains contained in multi-phase samples influence the degree of preferred orientation in XRD powder mounts. Two minerals, both of platy habit, were found to show different degrees of preferred orientation in front- and side-loaded samples. In contrast to these methods of sample preparation, the spray-drying technique yielded perfect randomness of the particles. The experiments on artificial mineral mixtures demonstrate that the model applied can effectively correct for preferred orientation allowing reliable Rietveld quantitative phase analysis of moderately textured samples prepared by standard techniques.
机译：通过Rietveld程序BGMN中实施的校正模型，对通过标准技术制备的粉末X射线衍射（XRD）样品中矿物晶粒的优选取向度进行了评估。事实证明，在McCrone微粉化磨机中通过湿法研磨获得的矿物粉末，无论正面加载还是侧面加载，都不会产生带有随机取向颗粒的粉末填充物。尽管进行了精细研磨，但多相样品中所含矿物质的主要尺寸和形状会影响XRD粉末安装座中的首选取向程度。发现两种矿物都是板状习性，在正面和侧面加载的样品中显示出不同程度的优选取向。与这些样品制备方法相比，喷雾干燥技术产生了完美的颗粒随机性。在人造矿物混合物上进行的实验表明，所应用的模型可以有效地校正首选方向，从而可以对通过标准技术制备的中等纹理样品进行可靠的Rietveld定量相分析。

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