Abstract
Calcium borohydroxyapatite was synthesized by the solid-state reaction of colemanite (Ca 2B 6O 11·5H 2O) and diamonium hydrogenphosphate ((NH 4) 2HPO 4) at 1200 °C for 12 h. X-ray diffraction pattern showed only the formation of calcium borohydroxyapatite. The experimental analysis assigned the chemical formula as Ca 10[(PO 4) 5.80(BO 3) 0.20](OH) 2. It was indexed in the hexagonal system with the refined unit cell parameters of a = 9.557(3) Å, c = 6.926(8) Å and space group P6 3/ m. The experimental results verified that if colemanite was used as a primary reactant for both calcium and boron source, the calcium borohydroxyapatite could be obtained.
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