HYDROTHERMAL SYNTHESIS AND PARTICLE SIZE CONTROL OF HYDROXYAPATITE SOLID SOLUTIONS WITH VANADATE

Abstract

The purpose of this paper is to report on hydrothermal synthesis of hydroxyapatite solid solutions with vanadate, Ca 10 (PO 4) 6-x (VO 4) x (OH) 2. We investigated effects of NaOH concentration (0.4-1.2 M) and reaction temperature (30-225°C) on the formation of Ca 10 (PO 4) 2 (VO 4) 4 (OH) 2 powder. The prepared powders were characterized using elemental analysis, X-ray diffraction, and TEM observation. The white Ca 10 (PO 4) 2 (VO 4) 4 (OH) 2 powders were hydrothermally synthesized using aqueous solutions of NaOH concentration more than 0.9 M. The particle size increased from 16.4 nm (30°C) to 71.1 nm (225°C) with increasing the reaction temperature without changing the crystal structure and morphology.