Synthesis of Calcium-Phosphate Powder from Calcium Formiate and Ammonium Hydrophosphate for Obtaining Biocompatible Resorbable Biphase Ceramic Materials

Abstract

Calcium phosphate powder was synthesized from calcium formiate Ca(CHO₂)₂ and ammonium hydrophosphate (NH₄)₂ HPO₄ with Ca/P ratio in the initial water solutions equal to 1. The phase composition of the powders synthesized from 0.5M solutions was represented by brushite CaHPO₄ · 2H₂O and octacalcium phosphate Ca₈(HPO₄)₂ (PO₄)₆ · 6H₂O. After firing at 1100°C the phase composition of the powder was represented by calcium pyrophosphate β-Ca₂P₂O₇ and tricalcium phosphate β-Ca₃ (PO₄)₂. The synthesized powder can be used to obtain biocompatible resorbable biphase ceramic materials and composites with a polymer matrix.