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Article

Crystal Chemistry and Luminescence Properties of Eu-Doped Polycrystalline Hydroxyapatite Synthesized by Chemical Precipitation at Room Temperature

1
Istituto di Cristallografia, IC-CNR, Via G. Amendola, 122/O, 70126 Bari, Italy
2
Dipartimento di Scienze della Terra e Geoambientali, Università di Bari, via E. Orabona 4, 70125 Bari, Italy
3
Istituto di Nanotecnologia, NANOTEC-CNR, Dipartimento di Chimica, Università di Bari, via E. Orabona 4, 70123 Bari, Italy
4
FIMIF, University Polytechnic of Tirana, 1000 Tirana, Albania
5
Dipartimento di Scienze, Università Roma Tre, Largo S. L. Murialdo 1, Rome 00146, Italy
6
Istituto di Cristallografia, IC-CNR, Via Salaria Km 29.300, 00016 Monterotondo (Rome), Italy
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(4), 250; https://doi.org/10.3390/cryst10040250
Received: 13 March 2020 / Revised: 24 March 2020 / Accepted: 26 March 2020 / Published: 27 March 2020
Europium-doped hydroxyapatite Ca10(PO4)6(OH)2 (3% mol) powders were synthesized by an optimized chemical precipitation method at 25 °C, followed by drying at 120 °C and calcination at 450 °C and 900 °C. The obtained nanosized crystallite samples were investigated by means of a combination of inductively coupled plasma (ICP) spectroscopy, powder X-ray diffraction (PXRD), Fourier Transform Infrared (FTIR), Raman and photoluminescence (PL) spectroscopies. The Rietveld refinement in the hexagonal P63/m space group showed europium ordered at the Ca2 site at high temperature (900 °C), and at the Ca1 site for lower temperatures (120 °C and 450 °C). FTIR and Raman spectra showed slight band shifts and minor modifications of the (PO4) bands with increasing annealing temperature. PL spectra and decay curves revealed significant luminescence emission for the phase obtained at 900 °C and highlighted the migration of Eu from the Ca1 to Ca2 site as a result of increasing calcinating temperature. View Full-Text
Keywords: hydroxyapatite; europium; chemical precipitation method; PXRD; FTIR; Raman and PL spectroscopy hydroxyapatite; europium; chemical precipitation method; PXRD; FTIR; Raman and PL spectroscopy
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MDPI and ACS Style

Baldassarre, F.; Altomare, A.; Corriero, N.; Mesto, E.; Lacalamita, M.; Bruno, G.; Sacchetti, A.; Dida, B.; Karaj, D.; Ventura, G.D.; Capitelli, F.; Siliqi, D. Crystal Chemistry and Luminescence Properties of Eu-Doped Polycrystalline Hydroxyapatite Synthesized by Chemical Precipitation at Room Temperature. Crystals 2020, 10, 250. https://doi.org/10.3390/cryst10040250

AMA Style

Baldassarre F, Altomare A, Corriero N, Mesto E, Lacalamita M, Bruno G, Sacchetti A, Dida B, Karaj D, Ventura GD, Capitelli F, Siliqi D. Crystal Chemistry and Luminescence Properties of Eu-Doped Polycrystalline Hydroxyapatite Synthesized by Chemical Precipitation at Room Temperature. Crystals. 2020; 10(4):250. https://doi.org/10.3390/cryst10040250

Chicago/Turabian Style

Baldassarre, Francesco, Angela Altomare, Nicola Corriero, Ernesto Mesto, Maria Lacalamita, Giovanni Bruno, Alberto Sacchetti, Bujar Dida, Dafina Karaj, Giancarlo D. Ventura, Francesco Capitelli, and Dritan Siliqi. 2020. "Crystal Chemistry and Luminescence Properties of Eu-Doped Polycrystalline Hydroxyapatite Synthesized by Chemical Precipitation at Room Temperature" Crystals 10, no. 4: 250. https://doi.org/10.3390/cryst10040250

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