Author/Authors :
Sasani، .N نويسنده Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran. Sasani, .N , Khadivi Ayask، .H نويسنده .Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran Khadivi Ayask, .H , Zebarjad، .S.M نويسنده .Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran Zebarjad, .S.M , Vahdati Khaki، .J نويسنده .Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran Vahdati Khaki, .J
Abstract :
In this research, high purity fluorapatite (FA) with rod-like and spherical-like morphology was synthesized via sol-gel method. Triethyl phosphate [(C2H5)3PO4] and calcium nitrate [Ca (NO3)2] were used as precursors under an ethanol-water based solution for FA production. Controlled amounts of ammonium fluoride (NH4F) were incorporated for the preparation of the FA sol-gels. FA gels were prepared by mixing of P, F and Ca sols and subsequently drying and calcination of gels. In this work, the effects of some sol-gel parameters have investigated on gelation time of FA. Chemical characterization of FA powders was done by XRD and FTIR analyses. Crystallite samples were calculated using Scherer method. Morphology of FA powders was investigated with TEM and SEM images. The results revealed that increasing the time of hydrolysis of phosphate sols significantly decreased the gelation time of FA sols. Also, mixing temperature of P and Ca sols affects the gelation time of samples and increasing pH decreases the gelation time of FA sols. Morphological and chemical characterization of samples showed that the FA powders have high purity and rod-like and spherical-like morphology.
