Synthesis and
sintering studies of nanocrystalline hydroxyapatite powders doped with
magnesium and zinc.
Authors: Bhatt, H., and Kalita,
S.J.
Year of Publication: 2005
Published in: Proceedings
of 29th International Conference
on Advanced Ceramics and Composite, Cocoa Beach, FL, Advances in
Bioceramics and Biocomposites, D. Zhu and W. M. Kriven,
Editors; CESP,
Vol. 26, Issue 6, p17-23.
ABSTRACT
In this research, we have synthesized nanocrystalline
hydroxyapatite (Ca10(PO4)6(OH)2,
HAp) powders doped with magnesium and zinc using the water-based sol-gel
technique and characterized them. Calcium nitrate and triethyl phosphite were
used as starting materials. These chemicals were dissolved in distilled water, separately,
under vigorous stirring. As-prepared calcium nitrate sol was added drop wise
into the hydrolyzed phosphite sol and then aged and dried. Dried gel was then
crushed into fine white powders with the help of mortar and pestle and a
measured amount of magnesium oxide and zinc oxide powders were added to the
crushed amorphous powders, separately. Calcination was carried out at 250-500oC.
Morphology of the powders was determined using transmission electron
microscopy. TEM results revealed that the particle size diameter of powders
were in the range of 5-10 nm. Phase analyses were carried out using powder
X-ray diffraction technique. As-synthesized powders were also pressed
uniaxially in a steel mold to prepare dense ceramic structures. These green structures
were sintered at 1300oC for 6 h in a muffle furnace for
densification. Highest sintered density of 3.29 g/cc was measured for
magnesium-doped powder. ©
2005 American Ceramic Society.
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