APPLICATION OF THE RIETVELD METHOD IN CERAMIC BIOMATERIALS AS AN ALTERNATIVE TO THE STANDARD FOR THE CHARACTERIZATION OF CRYSTALLINE PHASES

Reference	Presenter	Authors (Institution)	Abstract
02-038	Klaidson Antonio Sousa Farias	Farias, K.A.(Universidade Federal de Campina Grande); Cardoso, M.J.(Universidade Federal de Campina Grande); Lima, R.J.(Universidade Federal de Campina Grande); Farias, K.R.(Universidade Estadual da Paraiba); Sousa, W.J.(Universidade Federal de Campina Grande); FOOK, M.V.(Universidade Federal de Campina Grande - UFCG); Morúa, O.C.(Universidade Federal de Campina Grande); Rodriguez, M.A.(Instituto de Cerámica y Vidrio);	Research related to medicine presents major challenges regarding the regeneration of living tissue and bones, seeking primarily to minimize surgical trauma. Among the materials, hydroxyapatite (HAp), can be applied to bone tissue engineering devices because of its similarity to the main component of the inorganic phase of bone exhibiting biocompatibility, biodegradability and bioactivity, as well as tricalcium phosphate (?-TCP). The synthesis chosen for the production of calcium phosphates was by chemical precipitation. In the preparation of the HAp was obtained by chemical precipitation at room temperature, the reaction between phosphoric acid H3PO4 and Ca(OH)2 calcium hydroxide was used. Using a constant stirring at room temperature, composed of a 4.0 M solution of H3PO4 was slowly dripped in a 4.0 M solution of Ca(OH)2. The suspension was then filtered, washed with distilled water and oven dried at 100°C for 24h, then sifted. Finally, the powder was calcined at 900°C / 3h with a heating rate of 15°C / min. The obtained ?-TCP was by suspension, using 100g Ca5 (PO4)3(OH) and 200mL of distilled water under mechanical agitation, after homogenization H3PO4 was added. The suspension was then poured into a vessel and oven dried at 60°C / 24 h for evaporation of water. The powder obtained after this process, received thermal treatment with sintering temperature 900°C at 1200°C for a period of 15h. In this way, the present work had as objective to relate the crystalline parameters obtained in the samples of the HAp and ?-TCP using the Rietveld refinement method, FTIR analyzes showed bands characteristic of calcium phosphates, identifying the presence of the functional groups consistent with the compositions of the standard materials. The X-ray diffraction allowed us to identify the presence of distinct crystalline phases, according to the standard Implants for surgery - Hydroxyapatite BS ISO 13779-3: 2008.
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