Synthesis and Characterization of Hydroxyapatite–Wollastonite Composite Powders by Sol–Gel Processing
Abstract:Composites of hydroxyapatite–wollastonite were synthesized by a sol–gel route using calcium acetate and triethyl phosphate as precursors of hydroxyapatite and high-purity natural wollastonite added in ratios of 20, 50, and 80 wt%. These composites were characterized by thermal analysis, X-ray diffraction, FT-IR and Raman spectroscopy, and scanning and transmission electron microscopic techniques. Formation of hydroxyapatite occurs at a relatively low temperature, about 420°C, accompanied by calcium carbonate; wollastonite remains unreacted. The composites were purified by heat treatment to a higher temperature and washed with hydrochloric acid and distilled water, to produce B-type carbonated hydroxyapatite–wollastonite composites as final products.
Document Type: Research Article
Affiliations: 1: Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora, Hermosillo, Sonora 83000, México 2: Departamento de Investigación en Física, Universidad de Sonora, Hermosillo, Sonora 83000, México 3: Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, Ensenada B.C. 22800, México 4: Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Santiago de Querétaro, Querétaro 76000, México
Publication date: July 1, 2008