Phase transformation of mechanically milled nano-sized gamma-alumina

    Authors

    S. F. Liu; L. G. Zhang;L. N. An

    Comments

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    Abbreviated Journal Title

    J. Am. Ceram. Soc.

    Keywords

    TEMPERATURE; TRANSITION; BOEHMITE; AL2O3; Materials Science, Ceramics

    Abstract

    The phase transformation of mechanically milled nano-sized gamma-alumina particles was investigated. The structures and phase presentation of the powders before and after milling were characterized using X-ray diffraction, transmission electron microscopy, and photoluminescence measurement. The phase transformation kinetics was investigated using differential scanning calorimetry. It was found that significant amounts of defects were generated by milling. These defects dramatically lowered the temperatures and activation energies of the transformation by promoting the nucleation and diffusion. The accumulation of the defects appears to show a logarithmic dependence of milling time.

    Journal Title

    Journal of the American Ceramic Society

    Volume

    88

    Issue/Number

    9

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    2559

    Last Page

    2563

    WOS Identifier

    WOS:000231634800038

    ISSN

    0002-7820

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