Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/6464
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
Series/Report no.: Int. Cl.<sup>9</sup> C04B35/447<b></b>
Abstract: Low temperature hydrothermal exchange reaction has been used to synthesize calcium phosphate materials comprising hydroxyapatite and β-tricalcium phosphate using CaO and NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> 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.
Description: 1492-1500
URI: http://hdl.handle.net/123456789/6464
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.48A(11) [November 2009]

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