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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Application of statistical methodology for the evaluation of mechanically activated phase transformation in nanocrystalline TiO_2
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Application of statistical methodology for the evaluation of mechanically activated phase transformation in nanocrystalline TiO_2

机译：统计方法在评估纳米晶TiO_2机械活化相变中的应用

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摘要

Response surface methodology was employed to study the effect of three factors, namely as milling time, milling speed and ball to powder weight ratio, on the mechanical activation of polymorphic phase transformation in nanocrystalline TiO_2 powder and identify the probable interactions between these factors. The response was the rutile percentage after annealing the samples. Based on the statistical analysis, ball to powder weight ratio was found as the most effective factor and just one statistically significant interaction was found between milling speed and ball to powder ratio. It was also shown that increasing the milling time has no significant effect on the phase transformation since the required activation energy for the phase transformation is unattainable under these conditions. The rutile percentage was calculated from X-ray diffraction patterns of the samples via Rietveld refinement method. Raman spectroscopy was employed to verify the phase composition analysis based on X-ray diffraction results.
机译：采用响应表面方法研究了研磨时间，研磨速度和球粉重量比这三个因素对纳米晶TiO_2粉末多晶相转变机械活化的影响，并确定了这些因素之间可能的相互作用。响应是样品退火后的金红石百分比。根据统计分析，发现球与粉的重量比是最有效的因素，而在研磨速度和球与粉的比之间仅发现了统计学上显着的相互作用。还表明增加研磨时间对相变没有显着影响，因为在这些条件下无法获得相变所需的活化能。金红石百分率是通过Rietveld精制方法根据样品的X射线衍射图计算得出的。拉曼光谱法用于基于X射线衍射结果验证相组成分析。

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