Infrared spectra of carbonate apatites: ν2-Region bands

Fleet, Michael E.

doi:10.1016/j.biomaterials.2008.12.007

Cited by 218 publications

(181 citation statements)

References 33 publications

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“…Additionally, the ions released did not cause re-precipitation of secondary phases either. Moreover, although in the present work high percentages of carbonate were obtained; those values were comparable to other reported works [56]. Most importantly, the position of the carbonate bands in the FTIR indicated the incorporation of carbonate ions in the phosphate positions as shown in Figure 2B.…”

Section: Discussionsupporting

confidence: 91%

In vitro degradation of calcium phosphates: Effect of multiscale porosity, textural properties and composition

et al. 2017

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Please cite this article as: Díez-Escudero, A., Espanol, M., Beats, S., Ginebra, M.P., In vitro degradation of calcium phosphates: effect of multiscale porosity, textural properties and composition, Acta Biomaterialia (2017), doi: http:// dx.doi.org/10. 1016/j.actbio.2017.07.033 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Discussionsupporting

confidence: 91%

In vitro degradation of calcium phosphates: Effect of multiscale porosity, textural properties and composition

et al. 2017

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“…The symmetric ʋ1 (stretching) mode assigned to PO 4 3-is represented by a single band at 966 cm . The two bands at 1430 cm -1 and 1458 cm -1 were assigned to ʋ2 vibration of CO 3 2-group located in the B site of apatite (carbonate substituting phosphate) [17]. The spectrum of main component of the phosphate rock reference sample is in a good agreement with published IR spectra of apatite [19][20][21].…”

Section: Ft-ir Characterizationsupporting

confidence: 82%

“…The XRD patterns of the treated phosphate rocks as well as the raw material are illustrated in Figure 1 Calcite and quartz diffraction lines are disappeared as a result of gettering process, also carbonate-fluorapatite has changed to fluorapatite because carbonates are decomposed by rapid thermal treatment. Therefore, it was proved in others works that rapid thermal treatment at 900°C leads to a phosphate with relatively higher P 2 O 5 and CaO contents and a disappearance of organic matter [16,17]. In this work CaO formed after rapid thermal treatment was eliminated by chemical attack in vapor phase (ACPV).…”

Section: Xrd Characterizationmentioning

confidence: 81%

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Application of Gettering Process on the Improvement of the Structural and Mineralogical Properties of Tunisian Phosphate Rock

Daik¹,

Lajnef²

2016

J Material Sci Eng

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The present study deals with the effects of gettering process on the structural and mineralogical composition of Tunisian phosphate rock. The treated samples were characterized to investigate the variation of physical structure and chemical composition as compared to the reference phosphate rock. The quantitative analysis of the impurities concentration before and after gettering treatment using energy-dispersive (EDX) reveals a significant reduction of impurity concentration (more than 75%) such as Al, Si, S, Na, and Mg. Scanning electron microscopy (SEM) shows that gettering process promoted structural alterations of phosphate rock sample due to fusion of impurities. The XRD patterns show that the chief mineral constituent of treated sample is only fluorapatite, while those in the reference ore were calcite, dolomite, quartz and carbonate-fluorapatite. FT-IR characterization show a disappearance of the bands related to calcite at 714 cm -1 as well as B carbonate situated at 1430 cm -1 , 1458 cm -1 after gettering treatment. This result is in good correlation with Raman analysis.

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“…It frequently contains minor amounts of carbonate, occurring naturally in substitution of phosphate (B site) and channel ions (A site) in the crystal structure (e.g. Fleet, 2009). While sedimentary deposits of carbonated fluorapatite yield the world's major phosphorus resources (Knudsen and Gunter, 2002), carbonated hydroxyapatite is the major inorganic component of vertebrate skeletons (Elliott, 2002).…”

Section: Introductionmentioning

confidence: 99%

Site-specific equilibrium isotopic fractionation of oxygen, carbon and calcium in apatite

Aufort

Ségalen

Gervais

et al. 2017

Geochimica et Cosmochimica Acta

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The stable isotope composition of biogenic apatite is an important geochemical marker that can record environmental parameters and is widely used to infer past climates, biomineralization processes, dietary preferences and habitat of vertebrates. In this study, theoretical equilibrium isotopic fractionation of oxygen, carbon and calcium in hydroxyapatite and carbonate-bearing hydroxyapatite is investigated using first-principles methods based on density-functional theory and compared to the theoretical isotopic fractionation properties of calcite, CO 2 and H 2 O. Considering the variability of apatite crystal-chemistry, special attention is given to specific contributions of crystal sites to isotopic fractionation. Significant internal fractionation is calculated for oxygen and carbon isotopes in CO 3 between the different structural sites occupied by carbonate groups in apatite (typically 7‰ for both 18 O/ 16 O and 13 C/ 12 C fractionation at 37°C). Compared with calcite-water oxygen isotope fractionation, occurrence of A-type substitution in apatite structure, in addition to the main B-type substitution, could explain the larger temperature dependence of oxygen isotope fractionation measured at low temperature between carbonate in apatite and water. Theoretical internal fractionation of oxygen isotopes between carbonate and phosphate in B-type carbonated apatite ($8‰ at 37°C) is consistent with experimental values obtained from modern and well-preserved fossil bio-apatites. Concerning calcium, theoretical results suggest a small fractionation between apatite and calcite (À0.17‰ at 37°C). Internal fractionation reaching 0.8‰ at 37°C occurs between the two Ca sites in hydroxyapatite. Furthermore, the Ca isotopic fractionation properties of apatite are affected by the occurrence of carbonate groups, which could contribute to the variability observed on natural samples. Owing to the complexity of apatite crystal-chemistry and in light of the theoretical results, measurements of site-specific isotopic fractionation properties could improve our understanding and the interpretation of isotopic records in apatites.

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Infrared spectra of carbonate apatites: ν2-Region bands

Cited by 218 publications

References 33 publications

In vitro degradation of calcium phosphates: Effect of multiscale porosity, textural properties and composition

In vitro degradation of calcium phosphates: Effect of multiscale porosity, textural properties and composition

Application of Gettering Process on the Improvement of the Structural and Mineralogical Properties of Tunisian Phosphate Rock

Site-specific equilibrium isotopic fractionation of oxygen, carbon and calcium in apatite

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