Formation of a new solid β tricalcium orthophosphate structure,from reaction between hydroxyapatite and ammonium sulfate |
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| Authors: | M. Marraha J-C. Heughebaert G. Bonel |
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| Affiliation: | Laboratoire de Physico-Chimie des Solides, ERA CNRS n° 263, 38 rue des Trente-Six Ponts, 31400 Toulouse, France |
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| Abstract: | The reaction which occur during heating, from room temperature to 1100°C, of a mixture of hydroxyapatite, Ca10(PO4)6(OH)2 [HAP] and ammonium sulfate (NH4)2SO4 [AS] are studied. The formation of Ca2(NH4)2(SO4)3, Ca2P2O7 and Ca(PO3)2 is observed between 200°C and 300°C; at 400°C CaSO4 appears. From 500 to 700°C, Ca(PO3)2 reacts with Ca SO4 and with HAP and gives β-Ca2P2O7. Lastly, from 700°C to 1000°C, β-Ca2P2O7 reacts with HAP and with CaSO4 and gives β-Ca3(PO4)2 [β-TCP]; From 1000 to 1100°C, β-TCP and CaSO4 react and form a sulfate ion containing calcium phosphosulfate, the structure of which is β-TCP |
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