Solid state synthesis of calcium borohydroxyapatite

Calcium borohydroxyapatite was synthesized by the solid-state reaction of colemanite (Ca2B6O11·5H2O) and diamonium hydrogenphosphate ((NH4)2HPO4) 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 Ca10[(PO4)5.80(BO3)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 P63/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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► A new calcium borohydroxyapatite was synthesized by solid-state reactions and structurally characterized.
► The colemanite was used as a primary reactant for both calcium and boron source in this study.
► It has some potential applications in bioceramic technology.
► The crystallographic data of material should be added in the database file of ICDD.