Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 11, Pages 2691-2696Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.02.025
Keywords
Bioceramics; Hydroxyapatite; Dehydroxylation; Microstructure
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Funding
- Swedish Governmental Agency for Innovation Systems (Vinnova)
- Swedish Research Council (VR) through the Berzelii centre
- Knut and Alice Wallenberg foundation
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Dense transparent hydroxyapatite (HAp) nanoceramic samples were prepared by spark plasma sintering of a commercial available granulated nanopowder. This made it possible for investigating the dehydroxylation behaviours of HAp in fully dense bulks. Post-SPS thermal annealing was performed in a temperature interval of 800 to 1100 degrees C in air. The phase analysis and microstructural characterization revealed that the dehydroxylation in fully dense HAp was initiated above 900 degrees C and its kinetics seems to be determined by the water vapour diffusion. Accordingly, a gradient structure consisting of porous interiors and a peculiar surface topography reflecting the water vapour escaping patterns were observed in samples experienced severe dehydroxylation. (c) 2012 Elsevier Ltd. All rights reserved.
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