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Low temperature hydrothermal synthesis of calcium phosphate ceramics: effect of excess Ca precursor on phase behavior

Alqap, Asep Sofwan F. and Iis, Sopyan (2009) Low temperature hydrothermal synthesis of calcium phosphate ceramics: effect of excess Ca precursor on phase behavior. Indian Journal Chemistry A, 48A. pp. 1492-1500. ISSN O975-0975

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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.

Item Type: Article (Journal)
Uncontrolled Keywords: Hydrothermal synthesis Hydroxyapatites Calcium deficient apatites Calcination Ceramics Calcium phosphates
Subjects: T Technology > TS Manufactures
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User: miss nur ain ahmad
Date Deposited: 03 Feb 2012 15:28
Last Modified: 03 Feb 2012 15:28
URI: http://irep.iium.edu.my/id/eprint/11535

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