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Microstructural characterization of ball‐milled α‐Al 2 O 3 : bimodal size distribution and shape anisotropy
Author(s) -
Deb Apurba Kanti,
Chatterjee Partha,
Sen Gupta Siba Prasad
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889806045614
Subject(s) - crystallite , materials science , ball mill , rietveld refinement , anisotropy , diffraction , characterization (materials science) , microstructure , particle size distribution , x ray crystallography , crystallography , mineralogy , analytical chemistry (journal) , composite material , particle size , metallurgy , crystal structure , chemistry , nanotechnology , optics , physics , chromatography
α‐Al 2 O 3 prepared by combustion technique was ball‐milled in a planetary ball‐mill for several hours. A detail microstructural characterization of the ball‐milled samples was performed by X‐ray line broadening analysis. X‐ray diffraction patterns from the milled materials showed super‐Lorentzian peak shapes for the α‐Al 2 O 3 peak profiles, attributed to a bimodal size distribution of the α‐Al 2 O 3 crystallites, one type of crystallites having spherical and the other having cylindrical morphology. Rietveld analysis using two different phase fractions of α‐Al 2 O 3 with different microstructural features yielded a low goodness‐of‐fit of the X‐ray data, indicating the suitability of the assumed model.