A new approach to spectroscopic and structural studies of the nano-sized silicate-substituted hydroxyapatite doped with Eu3+ ions

Nanocrystalline silicate-substituted hydroxyapatites Ca10−xEux(PO4)4(SiO4)2(OH)2 (where x = 0.5, 1.0, 2.0, 5.0 mol%) doped with Eu3+ ions were synthesized using a microwave assisted hydrothermal method and heat-treated in the temperature range from 700 to 1000 °C. The concentration of optically acti...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2019-06, Vol.48 (23), p.8303-8316
Main Authors: Targonska, S, Szyszka, K, Rewak-Soroczynska, J, Wiglusz, R J
Format: Article
Language:English
Subjects:
Apatite
Biomedical materials
Chemical synthesis
Emission spectra
Europium
Excitation spectra
Heat treatment
Hydroxyapatite
Infrared spectroscopy
Luminescence
Microscopy
Occupancy
Optical activity
Optical properties
Rietveld method
Scanning electron microscopy
Spectrum analysis
Substitutes
Transmission electron microscopy
X ray powder diffraction
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Summary:Nanocrystalline silicate-substituted hydroxyapatites Ca10−xEux(PO4)4(SiO4)2(OH)2 (where x = 0.5, 1.0, 2.0, 5.0 mol%) doped with Eu3+ ions were synthesized using a microwave assisted hydrothermal method and heat-treated in the temperature range from 700 to 1000 °C. The concentration of optically active Eu3+ ions was established in the range of 0.5–5 mol% to investigate the preference of occupancy sites. The structural and morphological properties of the obtained biomaterials were determined by using XRD (X-Ray Powder Diffraction), TEM (Transmission Electron Microscopy) and SEM (Scanning Electron Microscopy) techniques as well as infrared (IR) spectroscopy. The average particle sizes were calculated to be in the range from 20 nm to 80 nm by the Rietveld method. The charge compensation mechanism in europium(iii)-doped silicate-substituted hydroxyapatite was proposed in the Kröger–Vink-notation. The luminescence properties (the emission, excitation spectra and emission kinetics) of the Eu3+ ion-doped apatite were recorded depending on the dopant concentration. The existence of Eu2+ ions was confirmed by the emission spectra.
ISSN:1477-9226
1477-9234
DOI:10.1039/c9dt01025d