Síntese da hidroxiapatita e refinamento estrutural por difração de raios-x

Química Nova

Jorge Correa De Araújo²  Lídia Sena¹  Ivan Napoleão Bastos¹  Glória Dulce De Almeida Soares¹ 

[1] ,Universidade do Estado do Rio de Janeiro Faculdade de Formação de Professores São Gonçalo RJ ,Brasil

关键词: hydroxyapatite;    X-ray diffraction;    Rietveld method;   

DOI  :  10.1590/S0100-40422007000800011

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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