Structure and thermal stability of sodium and carbonate-co-substituted strontium hydroxyfluorapatites

Hidouri, Mustapha; Dorozhkin, Sergey V.

doi:10.1039/c8nj00950c

Cited by 18 publications

(12 citation statements)

References 26 publications

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Section: 𝐷 𝐾λ β / Cosθsupporting

confidence: 88%

“…These spectra exhibited a single isotropic signal indicating the existence of a unique crystallographic site for phosphorus in K-doped OH-FAp environment. The chemical shift of both samples found around 3.8 ppm was consistent with studies on substituted FAp [35,40]. As advanced by Šupová [39], a substitution of divalent Ca 2+ by monovalent K + caused a charge imbalance, and the electroneutrality could be maintained by creating vacancies or by simultaneous anionic and cationic substitutions.…”

Section: 𝐷 𝐾λ β / Cosθsupporting

confidence: 85%

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Sintering of Potassium Doped Hydroxy-Fluorapatite Bioceramics

et al. 2021

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The present study describes the influence of potassium and hydroxyl substitutions on the structural, thermal and mechanical properties of fluorapatite bioceramics. A set of non-stoichiometric ion-substituted compounds, with a chemical formula of Ca10−xKx(PO4)6F(2−2x)(OH)x with 0 ≤ x ≤ 1 synthesized by the wet precipitation method, were found to be single-phase apatites crystallizing in the hexagonal P63/m space group. The structural parameters, as well as the crystallite sizes, increased accordingly to the amount of added dopant-ions. The thermal behavior of these compounds, studied within the temperature range 500–1200 °C, indicated a partial decomposition of the apatitic phase and its transformation to tricalcium phosphate β-Ca3(PO4)2 at temperatures exceeding 750 °C. A relative density of the sintered samples achieved the highest value with x = 0.25 and reached about 95% after sintering at 1050 °C for 1 h. The microstructures of the sintered samples were of a trans-granular aspect and experienced an increase in the radius of their pores as x increased. The prepared bioceramic materials were mechanically characterized by means of Young’s modulus, flexural strength and fracture toughness measurements. The overall trend of these parameters evolved comparably to the relative density, and the maximum values obtained for x = 0.25 were measured to be 96 MPa, 47 MPa and 1.14 MPa·m1/2, respectively.

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Section: 𝐷 𝐾λ β / Cosθsupporting

confidence: 88%

Section: 𝐷 𝐾λ β / Cosθsupporting

confidence: 85%

Sintering of Potassium Doped Hydroxy-Fluorapatite Bioceramics

et al. 2021

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“…At least, the lattice parameter evolution demonstrates that CO3 2ions are incorporated into the crystal lattice of HFA. In HA, the substitution of PO4 3by CO3 2groups results in a decrease of the a parameter (-0.4%) and a slight increase of the c parameter (+0.06%), in the case of a B-type substitution only [45], [46]. Given the evolution of the cell parameters, it is reasonable to think that the substitution in our HFA is of B-type.…”

Section: Structural Analysismentioning

confidence: 89%

Mechanosynthesis of carbonate and lithium co-substituted hydroxyfluorapatite

Hajji

Gallet

Saviot

et al. 2022

Materials Research Bulletin

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“…Cation exchange at M I and M II sites by divalent cations in resulting HAs are studied in the past . The changes of lattice parameters as a function of the presence of cations (Na, Sr) , or anion (CO 3 ) are described in the literature. , Only a few Bragg peaks such as (300) and (002) are sensitive to ionic replacement. The (300) peak is overlapped by (211) and (202) reflections and is not well-resolved in HANa15.…”

Section: Discussionmentioning

confidence: 99%

Novel Route to Enhance the Solubility of Apatite, a Potential Nanofertilizer, through Structural Incorporation of Sodium and Potassium Ions

Sakhno

Jaisi

2021

ACS Agric. Sci. Technol.

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We investigated the selective incorporation of sodium and potassium, cations of highly soluble salts, in a hydroxyapatite nanoparticle (HANP) with the end goal to enhance the solubility. The indirect evidence of the incorporation of carbonate and K/Na into a HANP lattice was shown by changes in a-and c-lattice parameters in powder X-ray diffraction (PXRD) reflections. Similarly, the selectivity of carbonate incorporation between A-and B-type HANPs as a function of Na/K loading was revealed by Fourier-transform infrared spectroscopy (FTIR), where the depletion of columnar OH agreed with the propagation of Atype carbonate. K/Na incorporation is also evidenced from the partial phase transition of HANP to tricalcium phosphate (TCP) during calcination. The amount of TCP formed was double in Na-HANPs than in K-HANPs, even though Na and K loading and carbonate content were similar in both. The selectivity between K and Na incorporation most likely originated from their difference in crystal radii. These results provide clear evidence that monovalent Na/K atoms can enter the P6 3 /m lattice and thus increase the number of Schottky defects, which enhances solubility.

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Structure and thermal stability of sodium and carbonate-co-substituted strontium hydroxyfluorapatites

Abstract: Physicochemical characterization of sodium and carbonate co-substituted strontium hydroxyfluorapatite resulting in pure apatite with ionic vacancies as a biomaterial.

Cited by 18 publications

References 26 publications

Sintering of Potassium Doped Hydroxy-Fluorapatite Bioceramics

Sintering of Potassium Doped Hydroxy-Fluorapatite Bioceramics

Mechanosynthesis of carbonate and lithium co-substituted hydroxyfluorapatite

Novel Route to Enhance the Solubility of Apatite, a Potential Nanofertilizer, through Structural Incorporation of Sodium and Potassium Ions

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