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Bimodal size distribution and shape anisotropy in ball-milled nano-sized α-Al2O3
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DOI：10.1080/10426910600611250.png)
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Abstract
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alpha-Al2O3 prepared by combustion technique was ball-billed in a planetary mill in toluene medium at 300 rpm in ZrO2 pot with a ball to powder ratio 10: 1 for 1, 5, 10, 15, and 20 hours. X-ray diffraction pattern from the milled materials showed super-Lorentzian peak shapes for alpha-Al2O3 peak profiles. The super-Lorentzian peak shape has been attributed to the bimodal size distribution of the alpha-Al2O3 particles. Rietveld analysis using two different phase fractions of alpha-Al2O3 with different microstructural features yielded a low goodness-of-fit of the x-ray data indicating the suitability of the assumed model. The phase fraction of alpha-Al2O3 particles with smaller size increases with the milling time. Further the particles shapes were observed to be cylindrical in this case with the cylinder axis along the crystallographic c-axis. The cylinder diameter and the length were obtained to be 86 angstrom and 140 angstrom respectively after 20 hrs of milling. The alpha-Al2O3 particles of larger size are isotropic. It is, thus, proposed that milling induces bimodal size distribution in the initial hours of milling.
Keywords:
alpha-Al2O3
ball-mill
bimodal distribution
X-ray diffraction
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