The facile and phase pure evaluations of nano hydroxyaptite powder by sol-gel method

Abstract

A bioactive ceramic such as hydroxyaptite [HAP: Ca10(PO4)6(OH)2] is a versatile ceramic material and which can be used in dental and orthopeadic applications due to their excellent behaviour in the human body. The present investigation is aims to synthesis nano sized HAP by sol-gel method using different calcium sources such as calcium acetate and calcium nitrate with orthophosphoric acid as a phosphorus precursor respectively. These initial reactants are easily available and low cost reagents for the preparation of HAP powder. The calcium acetate with orthophosphoric acid leads to biphasic calcium phosphate which contains major phase as HAP and minor phase as ß-TCP with respect to different sintering temperatures. The calcium nitrate and orthophosphoric acid has produced, pure nano sized HAP without accompanying any other secondary phases at higher temperature treatments. The phase purity and crystallinity of HAP was improved with increasing in the heat treating process. The materials prepared from both calcium sources and orthophosphoric acid was subjected to characterize by powder XRD, FT-IR, SEM.