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New Ca2.90(Me2+)0.10(PO4)2 β-tricalcium Phosphates with Me2+ = Mn, Ni, Cu: Synthesis, Crystal-Chemistry, and Luminescence Properties

Istituto di Cristallografia–CNR, Via G. Amendola, 122/O, 70126 Bari, Italy
Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse, Università di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy
Faculté des Sciences Semlalia, BP 2390, Université Cadi Ayyad, Marrakech 40000, Morocco
Luminescent Materials Laboratory, Università di Verona, Ca’ Vignal, Strada Le Grazie 15, 37134 Verona, Italy
Dipartimento di Scienze, Università Roma Tre, Largo S. L. Murialdo 1, 00016 Monterotondo (Rome), Italy
Istituto di Cristallografia–CNR, Via Salaria Km 29.300, 00016 Monterotondo (Rome), Italy
Author to whom correspondence should be addressed.
Crystals 2019, 9(6), 288;
Received: 19 April 2019 / Revised: 23 May 2019 / Accepted: 28 May 2019 / Published: 1 June 2019
PDF [3983 KB, uploaded 1 June 2019]


C a 2.90 M e 0.10 2 + ( P O 4 ) 2 (with Me = Mn, Ni, Cu) β-tricalcium phosphate (TCP) powders were synthesized by solid-state reaction at T = 1200 °C and investigated by means of a combination of scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, and luminescence spectroscopy. SEM morphological analysis showed the run products to consist of sub spherical microcrystalline aggregates, while EDS semi-quantitative analysis confirmed the nominal Ca/Me composition. The unit cell and the space group were determined by X-ray powder diffraction data showing that all the compounds crystallize in the rhombohedral R3c whitlockite-type structure, with the following unit cell constants: a = b = 10.41014(19) Å, c = 37.2984(13) Å, and cell volume V = 3500.53(15) Å3 (Mn); a = b = 10.39447(10) Å, c = 37.2901(8) Å; V = 3489.22(9) Å3 (Ni); a = b = 10.40764(8) Å, c = 37.3158(6) Å, V = 3500.48(7) Å3 (Cu). The investigation was completed with the structural refinement by the Rietveld method. The FTIR spectra are similar to those of the end-member Ca β-tricalcium phosphate (TCP), in agreement with the structure determination, and show minor band shifts of the (PO4) modes with the increasing size of the replacing Me2+ cation. Luminescence spectra and decay curves revealed significant luminescence properties for Mn and Cu phases. View Full-Text
Keywords: TCP; SEM-EDS; PXRD and Rietveld refinement; FTIR; luminescence spectroscopy TCP; SEM-EDS; PXRD and Rietveld refinement; FTIR; luminescence spectroscopy

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Altomare, A.; Rizzi, R.; Rossi, M.; El Khouri, A.; Elaatmani, M.; Paterlini, V.; Della Ventura, G.; Capitelli, F. New Ca2.90(Me2+)0.10(PO4)2 β-tricalcium Phosphates with Me2+ = Mn, Ni, Cu: Synthesis, Crystal-Chemistry, and Luminescence Properties. Crystals 2019, 9, 288.

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