Síntese da hidroxiapatita e refinamento estrutural por difração de raios-x
AUTOR(ES)
Araújo, Jorge Correa de, Sena, Lídia, Bastos, Ivan Napoleão, Soares, Glória Dulce de Almeida
FONTE
Química Nova
DATA DE PUBLICAÇÃO
2007
RESUMO
A sample of hydroxyapatite was synthesized and its crystalline structure was analyzed by X-ray diffraction by means of the Rietveld method. Two functions were used to fit the peak profiles, modified Voigt (TCHZ) and Pearson VII. The occupational factors and lattice parameters obtained by both models show that the sample does not contain relevant cationic substitutions. The interatomic distances from Ca1 to oxygens O1, O2 and O3 were adequate for a pure hydroxyapatite without defect at site Ca1. Besides, the use of multiple lines in planes (300) and (002) associated with the model Pearson VII resulted in good agreement with the TCHZ model with respect to the size-strain effectswith an ellipsoidal shape of crystallites. In conclusion, the procedures adopted in the synthesis of hydroxyapatite produced a pure and crystalline material. The experimental results of transmission electron microscopy confirmed the predicted shape of crystals.
Documentos Relacionados
- Estudo de filmes finos por difração de raios-X
- Estudo de diamantes naturais com inclusões por difração de raios-X
- Medida precisa de parametros da rede cristalina por difração multipla de raios-X
- Estudo de ordenamento multipolar eletrico de holmio por difração de raios-X
- Largura de linhas de difração multipla dos raios-X