INVESTIGADORES
FANOVICH Maria Alejandra
artículos
Título:
Structural Analysis of Modified Hydroxyapatite Powders
Autor/es:
M.A. FANOVICH, M. S. CASTRO, J. M. PORTO LÓPEZ
Revista:
MATERIALS RESEARCH BULLETIN
Editorial:
Elsevier
Referencias:
Año: 2001 p. 487 - 496
ISSN:
0025-5408
Resumen:
In this work, the presence of structural defects in modified hydroxyapatite (HA) samples were
studied. The behavior of HA samples with different chemical compositions was compared. Structural
alterations were produced by thermal treatments and high-energy milling. Electron paramagnetic
resonance spectroscopy (EPR) was used in order to identify the presence of structural defects. Samples
were analyzed at room temperature and the signals observed by electron paramagnetic resonance at
g 5 1.999 were assigned to oxygen vacancies in the apatitic structure. The determination of vacancy
concentration (Vo) in each sample was related with the characteristic parameters of the signal and the
experimental conditions. XRD and SEM were used as additional characterization techniques. The
production and concentration of these vacancies was correlated to the modifications introduced during
the processing of the materials. The results were also related with the chemical composition, particle
size and crystallinity of the samples.