ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 42, (4) 164 - 170 (1998)


SYNTHESIS OF CALCIUM PHOSPHATES FROM ALKYL PHOSPHATES BY THE SOL-GEL METHOD
 
Cihlář Jaroslav, Částková Klára
 
Department of Ceramics, Institute of Materials Engineering, Technical University of Brno, Technická 2, 616 69 Brno

Syntheses of calcium phosphates from methyl-, ethyl-, i-propyl and n-butyl phosphates and calcium acetate in acidic and basic water-alcoholic solutions were studied. The composition of calcium phosphates depended mainly on the type of the used catalyst. Mixture of hydroxyapatite and β-tricalcium phosphate (β-TCP) was received by reaction of all alkylphosphates with calcium acetate in acidic solution. Calcium pyrophosphate was received when reaction proceeded in the presence of amonium hydroxide. Hydroxyapatite with admixture of calcium pyrophosphate or β-TCP were prepared by means of monoethanolamine or diethanolamine catalysts. It was found that the hydrolysis of P-OR bound played important role in calcium phosphate syntheses. The mechanism of the syntheses was proposed.


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