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Abstract
The preparation and the thermal behaviour of sulfovanadocalcium apatite. It is possible to prepare a sulfovanadoapatite by a gas/solid reaction at 700°C in a sulfur atmosphere. The substitution of a S2- ion and a vacancy for two divalent OH− ions in the hydroxyapatite Ca10(VO4)6(OH)2 leads to the sulfoapatite Ca10(PO4)6S□. This apatite crystallizes in the hexagonal system P63/m. The lattice constants are (a = 10,243 Å; c = 6,751 Å ± 0.003 Å). The oxidation of S−2 ion to SO2- 4 ion during a heat treatment at air, leads to the destruction of apatite into CaSO4 and Ca3(VO4)2.