Synthesis and characterization of Sr(10−x)Cdx(PO4)6Y2 (Y=OH and F): A comparison of apatites containing two divalent cations

Badraoui, Béchir; Aissa, Abdallah; Bigi, Adriana; Debbabi, Mongi; Gazzano, Massimo

doi:10.1016/j.materresbull.2008.07.015

Cited by 27 publications

(12 citation statements)

References 36 publications

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“…It is well known that, hydroxyapatite (HAP: Ca 10 (-PO 4 ) 6 (OH) 2 ) with a hexagonal crystal structure, is one member of the 'apatite' family (Tas 2000;Badraoui et al 2009). In osteology, calcium is one of the most important inorganic ions, in addition to phosphate given the key component of the mineralized bone matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases

et al. 2015

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Hydroxyapatite (HAP) and dicalcium phosphate dihydrate (brushite) nanoparticles were prepared by co-precipitation method. The obtained products were characterized by X-ray powder diffraction (XRD), Fourier transformation infra-red spectroscopy (FTIR) and thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) and transmission electron microscope (TEM) were used to investigate the morphology of the powdered samples as well as their microstructure, respectively. Brushite samples were obtained in a spherical shape, while hydroxyapatite was formed in a needle and rice shape depending on the pH value.

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Section: Introductionmentioning

confidence: 99%

Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases

et al. 2015

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“…This could be a consequence of the higher electronegativity of RE 3+ ions, resulting in an increased tendency for creating covalent bonds with hydroxyl groups. In the HAp structure, hydroxyl groups are positioned in the channels surrounded by Ca2 cations 44 ; therefore, a larger amount of RE 3+ ions is detected at this site, regardless of their total content. The successful incorporation of smaller RE 3+ ions at both Ca sites is also reflected in the shortening of the average Ca-O distances (from 2.601 to 2.560 Å and from 2.467 to 2.450 Å for Ca1-O and Ca2-O, respectively, versus the calculated 2.58 Å for the sum of nine-coordinated Ca1 2+ + O 2− , and 2.46 Å for the sum of seven-coordinated Ca2 2+ + O 2− ionic radii), Table 3.…”

Section: Resultsmentioning

confidence: 99%

Rare-earth (Gd3+,Yb3+/Tm3+, Eu3+) co-doped hydroxyapatite as magnetic, up-conversion and down-conversion materials for multimodal imaging

Ignjatović

Mančić

Vuković

et al. 2019

Sci Rep

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Taking advantage of the flexibility of the apatite structure, nano-and micro-particles of hydroxyapatite (HAp) were doped with different combinations of rare earth ions (RE 3+ = Gd, eu, Yb, tm) to achieve a synergy among their magnetic and optical properties and to enable their application in preventive medicine, particularly diagnostics based on multimodal imaging. All powders were synthesized through hydrothermal processing at t ≤ 200 °C. An X-ray powder diffraction analysis showed that all powders crystallized in P6 3 /m space group of the hexagonal crystal structure. The refined unit-cell parameters reflected a decrease in the unit cell volume as a result of the partial substitution of Ca 2+ with smaller Re 3+ ions at both cation positions. the ftiR analysis additionally suggested that a synergy may exist solely in the triply doped system, where the lattice symmetry and vibration modes become more coherent than in the singly or doubly doped systems. HAp:Re 3+ optical characterization revealed a change in the energy band gap and the appearance of a weak blue luminescence (λ ex = 370 nm) due to an increased concentration of defects. the "up"-and the "down"-conversion spectra of HAp:Gd/Yb/tm and HAp:Gd/eu powders showed characteristic transitions of tm 3+ and eu 3+ , respectively. furthermore, in contrast to diamagnetic HAp, all HAp:Re 3+ powders exhibited paramagnetic behavior. cell viability tests of HAp:Gd/Yb/tm and HAp:Gd/eu powders in human dental pulp stem cell cultures indicated their good biocompatibility.

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“…In particular, the two different cationic environments M (1) and M (2) are able to accommodate a variety of univalent, bivalent and trivalent cations as substituents. Numerous reports are available on alkaline earth and other divalent ions substituted hydroxy and fluorapatites [10,11], hydroxyfluoro apatites [12] and rare earth ion (RE 3+ ) substituted apatites [13]. The resultant compositions are considered to be potential candidates for various applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of apatite phosphates containing Cs+, Sr2+ and RE3+ ions and chemical durability studies

Kumar

Buvaneswari

2013

Materials Research Bulletin

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Synthesis and characterization of Sr(10−x)Cdx(PO4)6Y2 (Y=OH and F): A comparison of apatites containing two divalent cations

Cited by 27 publications

References 36 publications

Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases

Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases

Rare-earth (Gd3+,Yb3+/Tm3+, Eu3+) co-doped hydroxyapatite as magnetic, up-conversion and down-conversion materials for multimodal imaging

Synthesis of apatite phosphates containing Cs+, Sr2+ and RE3+ ions and chemical durability studies

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