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- Title
Grain-Size Dependence of the Hardness of Submicrometer and Nanometer Hydroxyapatite.
- Authors
Jiwen Wang; Shaw, Leon L.
- Abstract
Dense hydroxyapatite (HA) bodies (at 99% of the theoretical density or higher) with grain sizes ranging from 67 to 732 nm have been obtained via a process of morphology-enhanced low-temperature sintering at temperatures as low as 850°C. The Knoop indentation study reveals that the hardness of HA exhibits a linear dependence on the inverse square root of the grain diameter, consistent with the Hall–Petch relationship. This is the first report of the grain-size dependence of the HA hardness in the nanometer range, and the phenomena observed suggest that the deformation of HA under indentation is dislocation mediated.
- Subjects
TOKYO (Japan); JAPAN; HYDROXYAPATITE; APATITE; SCANNING electron microscopy; JEOL Ltd.; X-ray diffraction; OPTICAL diffraction; ELECTRON microscopy
- Publication
Journal of the American Ceramic Society, 2010, Vol 93, Issue 3, p601
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2009.03455.x