XRD, AFM, IR and TGA study of nanostructured hydroxyapatite

Materials Research

Mirta Mir²  Fabio Lima Leite¹  Paulo Sérgio De Paula Herrmann Junior¹  Fabio Luiz Pissetti²  Alexandre Malta Rossi¹  Elizabeth Lima Moreira¹  Yvonne Primerano Mascarenhas¹ 

[1] ,Federal University of Alfenas Institute of Exact Science Alfenas MG ,Brazil

关键词: nanocrystals;    AFM;    XRD;    hydroxyapatite;    Rietveld;    TGA e IR;   

DOI  :  10.1590/S1516-14392012005000069

来源: SciELO

【 摘 要 】

In this work, the synthetic hydroxyapatite (HAP) was studied using different preparation routes to decrease the crystal size and to study the temperature effect on the HAP nano-sized hydroxyapatite crystallization. X-ray diffraction (XRD) analysis indicated that all samples were composed by crystalline and amorphous phases . The sample with greater quantity of amorphous phase (40% of total mass) was studied. The nano-sized hydroxyapatite powder was heated and studied at 300, 500, 700, 900 and 1150 °C. All samples were characterized by XRD and their XRD patterns refined using the Rietveld method. The crystallites presented an anisotropic form, being larger in the [001] direction. It was observed that the crystallite size increased continuously with the heating temperature and the eccentricity of the ellipsoidal shape changed from 2.75 at 300 °C to 1.94, 1.43, 1.04 and 1.00 respectively at 500, 700, 900 and 1150 °C. In order to better characterize the morphology of the HAP the samples were also examined using atomic force microscopy (AFM), infrared spectrometry (IR) and thermogravimetric analysis (TGA).

【 授权许可】

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