XRD, AFM, IR and TGA study of nanostructured hydroxyapatite
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
---|---|
Data(s) |
04/11/2013
04/11/2013
2012
|
Resumo |
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). |
Identificador |
Mat. Res.,v.15,n.4,p.622-627,2012 1516-1439 http://www.producao.usp.br/handle/BDPI/39846 10.1590/S1516-14392012005000069 http://www.scielo.br/scielo.php?script=sci_pdf&pid=S1516-14392012000400021&lng=en&nrm=iso&tlng=en |
Idioma(s) |
eng |
Publicador |
ABM, ABC, ABPol |
Relação |
Materials Research |
Direitos |
openAccess |
Palavras-Chave | #nanocrystals #AFM #XRD #hydroxyapatite #Rietveld #TGA e IR |
Tipo |
article original article |