Synthesis of hydroxyapatite and structural refinement by x-ray diffraction

Quimica nova

Sena, Lídia¹  Soares, Glória Dulce de Almeida²  Bastos, Ivan Napoleão³  Araújo, Jorge Correa de⁴ 

[1] Instituto Nacional de Metrologia, Normalização e Qualidade Industrial, Duque de Caxias, Brasil;Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil;Universidade do Estado do Rio de Janeiro, Nova Friburgo, Brasil;Universidade do Estado do Rio de Janeiro, São Gonçalo, Brasil

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 andits crystalline structure was analyzed by X-ray diffraction by means of theRietveld method. Two functions were used to fit the peak profiles, modifiedVoigt (TCHZ) and Pearson VII. The occupational factors and lattice parametersobtained by both models show that the sample does not contain relevant cationicsubstitutions. The interatomic distances from Ca1 to oxygens O1,O2 and O3 were adequate for a pure hydroxyapatite without defectat site Ca1. Besides, the use of multiple lines in planes (300)and (002) associated with the model Pearson VII resulted in good agreementwith the TCHZ model with respect to the size-strain effectswith an ellipsoidalshape of crystallites. In conclusion, the procedures adopted in the synthesisof hydroxyapatite produced a pure and crystalline material. The experimentalresults of transmission electron microscopy confirmed the predicted shape ofcrystals.

【 授权许可】

CC BY