Rare earth elements doped -tricalcium phosphates Ca⁠9RE(PO⁠4)⁠7 (RE = La, Pr, Nd, Eu, Gd, Dy, Tm, Yb) were synthesized by solid-state reaction at T = 1200 C. The obtained RE-doped -TCP phases were studied by a combination of Scanning Electron Microscopy (SEM) equipped with energy dispersive X-Ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier Transform Infra Red (FTIR) and Raman spectroscopies. SEM morphological analyses revealed the presence of sub spherical micro crystalline aggregates, while EDS semi-quantitative analyses conTrmed the nominal RE/Ca composition for all the phases. The unit cell and the space group were determined by X-ray powder diffraction data showing that all phases in the series crystallize in the rhombohedral R3c whitlockite-type structure; the unit cell constants are a linear function of the dimension of the substituting rare-earth element, and range from a = b = 10.4695(3) , c = 37.500(3) and V = 3559.7(2) ⁠3 (La) up to a = b = 10.4073(2) , c = 37.2725(2) , V = 3496.2(2) ⁠3 (Yb). The analysis of each compound was completed with the structure model reTnement by the Rietveld method and the distribution of RE within the available structural sites is discussed according to the results of the Rietveld reTnement. The FTIR and Raman spectra show slight band shifts of the phosphate modes correlated to the evolving size of the RE element.

Synthesis, structure reTnement and vibrational spectroscopy of new rare-earth tricalcium phosphates Ca⁠9RE(PO⁠4)⁠7 (RE = La, Pr, Nd, Eu, Gd, Dy, Tm, Yb) / Asmaa, El Khouri; Mohammed, Elaatmani; Giancarlo, Della Ventura; Armida, Sodo; Rosanna, Rizzi; Rossi, Manuela; Francesco, Capitelli. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - 43:(2017), pp. 15645-15653. [10.1016/j.ceramint.2017.08.121]

Synthesis, structure reTnement and vibrational spectroscopy of new rare-earth tricalcium phosphates Ca⁠9RE(PO⁠4)⁠7 (RE = La, Pr, Nd, Eu, Gd, Dy, Tm, Yb)

ROSSI, MANUELA
Membro del Collaboration Group
;
2017

Abstract

Rare earth elements doped -tricalcium phosphates Ca⁠9RE(PO⁠4)⁠7 (RE = La, Pr, Nd, Eu, Gd, Dy, Tm, Yb) were synthesized by solid-state reaction at T = 1200 C. The obtained RE-doped -TCP phases were studied by a combination of Scanning Electron Microscopy (SEM) equipped with energy dispersive X-Ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier Transform Infra Red (FTIR) and Raman spectroscopies. SEM morphological analyses revealed the presence of sub spherical micro crystalline aggregates, while EDS semi-quantitative analyses conTrmed the nominal RE/Ca composition for all the phases. The unit cell and the space group were determined by X-ray powder diffraction data showing that all phases in the series crystallize in the rhombohedral R3c whitlockite-type structure; the unit cell constants are a linear function of the dimension of the substituting rare-earth element, and range from a = b = 10.4695(3) , c = 37.500(3) and V = 3559.7(2) ⁠3 (La) up to a = b = 10.4073(2) , c = 37.2725(2) , V = 3496.2(2) ⁠3 (Yb). The analysis of each compound was completed with the structure model reTnement by the Rietveld method and the distribution of RE within the available structural sites is discussed according to the results of the Rietveld reTnement. The FTIR and Raman spectra show slight band shifts of the phosphate modes correlated to the evolving size of the RE element.
2017
Synthesis, structure reTnement and vibrational spectroscopy of new rare-earth tricalcium phosphates Ca⁠9RE(PO⁠4)⁠7 (RE = La, Pr, Nd, Eu, Gd, Dy, Tm, Yb) / Asmaa, El Khouri; Mohammed, Elaatmani; Giancarlo, Della Ventura; Armida, Sodo; Rosanna, Rizzi; Rossi, Manuela; Francesco, Capitelli. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - 43:(2017), pp. 15645-15653. [10.1016/j.ceramint.2017.08.121]
File in questo prodotto:
File Dimensione Formato  
2017. Synthesis, structure refinement and vibrational spectroscopy of new rare-earth tricalcium phosphates Ca9RE(PO4)7 (RE = La, Pr, Nd, Eu,.pdf

solo utenti autorizzati

Descrizione: 2017. Synthesis, structure refinement and vibrational spectroscopy of new rare-earth tricalcium phosphates Ca9RE(PO4)7 (RE = La, Pr, Nd, Eu,
Tipologia: Documento in Post-print
Licenza: Accesso privato/ristretto
Dimensione 1.24 MB
Formato Adobe PDF
1.24 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/682896
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 29
  • ???jsp.display-item.citation.isi??? 29
social impact