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Raman and cathodoluminescence spectroscopies of magnesium-substituted hydroxyapatite powders

Published online by Cambridge University Press:  01 April 2005

S. Sprio ,
G. Pezzotti ,
G. Celotti ,
E. Landi  and
A. Tampieri
S. Sprio
Affiliation:
Institute of Science and Technology for Ceramics-National Research Council,48018 Faenza (RA), Italy
G. Pezzotti
Affiliation:
Ceramic Phaysics Laboratory & Research Institute for Nanoscience (RIN), Kyoto Institute of Technology, Kyoto 606-8585, Japan
G. Celotti
Affiliation:
Institute of Science and Technology for Ceramics-National Research Council, 48018 Faenza (RA), Italy
E. Landi
Affiliation:
Institute of Science and Technology for Ceramics-National Research Council, 48018 Faenza (RA), Italy
A. Tampieri
Affiliation:
Institute of Science and Technology for Ceramics-National Research Council, 48018 Faenza (RA), Italy
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Abstract

Stoichiometric and magnesium-substituted synthetic hydroxyapatite (HA) powders with different Mg contents were characterized by Raman and cathodoluminescence (CL) spectroscopies. The substitution of Ca ions by Mg is presently of great interest because it may improve activity in the first stage of the bone remodeling process. In this paper, we show new evidence that CL spectroscopy has the capability to detect the presence of crystal defects, related to the presence of magnesium substituting calcium in Mg-doped HA powders. The dependence of CL spectra of stoichiometric and magnesium-doped HA powders on their chemical composition was studied, and the results are compared with Raman analysis and data previously collected by other analytical tools. All the investigated powders showed five distinct CL bands; moreover, in magnesium-doped HA, an additional band at higher energy was found. The intensity ratios between selected CL bands showed some relationships with the powder crystallinity and the estimated amount of magnesium both in the HA lattice and in the amorphous surface layer; moreover the band observed only in magnesium-substituted powders could be directly related to the amount of magnesium entered into the HA lattice. Such results can contribute to improve the knowledge of the crystallographic structure of Mg-substituted hydroxyapatite.

Keywords

BiomedicalChemical substitutionLuminescence
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 1009 - 1016
Copyright
Copyright © Materials Research Society 2005

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