Synthesis of Nano Crystalline Hydroxyapatite from Egg Shells by Combustion Method

Abstract

Hydroxyapatite (HA) has been widely used as a biocompatible ceramic in many areas of medicine, but mainly for contact with bone tissue, due to similarity in composition and crystal structure of natural bone. This paper reports for synthesizing hydroxyapatite [Ca10(PO4)6(OH)2] powder wirh Ca/P molar ratio 1.67 from egg shells ,orthophosphoric acid. Fourier-transform infrared (FT–IR) and X-ray diffraction (XRD) techniques were employed to investigate the formation of the HAP phase. Thermal analysis (TG–DTA) was carried out to investigate the thermal stability of HAP powder. FT–IR spectra show the characteristic peaks for phosphate and hydroxyl groups.