4.7 Article

Crystallite size reduction of Cr doped Al2O3 materials via optimized high-energy ball milling method

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ADVANCED POWDER TECHNOLOGY
卷 34, 期 8, 页码 -

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ELSEVIER
DOI: 10.1016/j.apt.2023.104102

关键词

Al2_xCrxO3; Doped; Combustion; Ball milling

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The crystallite size of a-Al2O3 based compounds is difficult to reduce due to their stability and hardness, but can be achieved through high-energy ball milling method. Micron-sized a-Al2_xCrxO3 materials were obtained and then subjected to a simple milling process. The milled samples showed no impurity or other phases and had a slightly larger cell volume compared to the micron-sized materials. With increased milling time, there was a gradual decrease in crystallite size. The method successfully reduced the crystallite size without affecting the phase and stoichiometry of the materials, potentially leading to improved properties in various applications.
a-Al2O3 based compounds have large crystals and it is very difficult to reduce the crystallite size because they are very stable and hard. One way of reducing the crystallite size of the materials is by using high-energy ball milling method. Pure and single-phase micron-sized a-Al2_xCrxO3 (x = 0.1, 0.2, 0.3) materials were successfully obtained via self-propagating combustion method. These materials were then sub-jected to a simple milling process from their microcrystalline powders. Comparisons between the micron-sized and milled samples in terms of their phase, structure, morphology and crystallite size were discussed. The XRD results reveal that all the milled samples were pure with no impurity or other phases present. Structural parameters are extracted via the Rietveld method, revealing that the cell constant, a, of the milled samples is higher than that of the micron-sized materials by 0.09 % to 0.11 %, resulting in a 0.28 % to 0.39 % increase in cell volume. FESEM results show a gradual decrease in crystallite size with increased milling time. Notably, the method successfully reduces the crystallite size without changing the phase of the materials and preserving the stoichiometry of the Al2_xCrxO3 materials which may offer improved properties in various applications.& COPY; 2023 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.

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