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Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.48A [2009] >
IJC-A Vol.48A(11) [November 2009] >
| Title: | Low temperature hydrothermal synthesis of calcium phosphate ceramics: Effect of excess Ca precursor on phase behaviour |
| Authors: | Alqap, Asep Sofwan Faturohman
Sopyan, Iis |
| Keywords: | Hydrothermal synthesis
Hydroxyapatites
Calcium deficient apatites
Calcination
Ceramics
Calcium phosphates |
| Issue Date: | Nov-2009 |
| Publisher: | CSIR |
| IPC Code: | Int. Cl.9 C04B35/447 |
| Abstract: | Low
temperature hydrothermal exchange reaction has been used to synthesize calcium
phosphate materials comprising hydroxyapatite and β-tricalcium phosphate using
CaO and NH4H2PO4 as calcium and phosphorus
precursors respectively. The effect of excess of calcium precursor on phase behaviour
of these materials has been investigated by varying CaO content (0, 10 and 20
mole% excess of 0.1 mole CaO) in the suspension. The as-synthesized paste has
been dried followed by calcination at 700-1200 ºC. Results show the formation
of Ca-deficient apatite at the lower calcination temperature. Excess of CaO
shifts the balance to hydroxyapatite formation at the higher calcination
temperature such that β-tricalcium phosphate, β-tricalcium phosphate +
hydroxyapatite and hydroxyapatite of higher purity are obtained with 0, 10 and
20 mole% excess CaO, respectively. |
| Page(s): | 1492-1500 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.48A(11) [November 2009]
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