Synthesis of hydroxyapatite and structural refinement by x-ray diffraction

Química Nova

Sena, Lídia¹  Universidade do Estado do Rio de Janeiro, Nova Friburgo, Brasil¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil¹  Araújo, Jorge Correa de¹  Bastos, Ivan Napoleão¹  Instituto Nacional de Metrologia, Normalização e Qualidade Industrial, Duque de Caxias, Brasil¹  Soares, Glória Dulce de Almeida¹  Universidade do Estado do Rio de Janeiro, São Gonçalo, Brasil¹ 

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

DOI  :  10.1590/S0100-40422007000800011

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown