Solid state synthesis of calcium borohydroxyapatite

摘要

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) A, c = 6.926(8) A and space group Pб_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.