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Physico-chemical characterization of calcium-apatite prepared with a calcium/phosphate ratio around the stoichiometry

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Abstract

Calcium phosphate materials synthesized from apatite with atomic Ca/P ratios ranging from 1.50 to 1.67 (Ca10-x(HPO4)x(PO4)6-x(OH)2-x (0 ≤ x ≤ 1)) have very interesting applications in bone regeneration and in the environment field for the removal of toxic species. The physicochemical characteristics of synthetic calcium apatite change when the Ca/P ratio varies. In this study, two batches of apatite powder were prepared by precipitation in an aqueous medium at 25 °C with Ca/P molar ratios that were close to those of tricalcium phosphate (1.48, 1.50, and 1.52) and close to those of hydroxyapatite (1.65, 1.67, and 1.72). For dried and ceramized powders, the chemical composition, morphology, surface area, compacity, durability, and crystalline phases of prepared powders were studied. The result shows that the dried powders composed of nanocrystals are poorly crystallized. The sample with the lowest Ca/P atomic ratio (1.48) shows the lowest specific surface area (75 ± 5 m2/g) with good compaction ability and acceptable mechanical properties. While stoichiometric HAP (Ca/P = 1.67) has a large specific area (110 ± 5 m2/g), however, it has poor compaction properties. Calcined apatite (Ca/P = 1.65) at 900 °C composed of HAP with traces of tricalcium phosphate (Ca3(PO4)2: βTCP) shows a higher compressive strength (78 ± 10 MPa). βTCP ceramic with Ca/P = 1.48 has the lowest optical gap (OG = 4.6 ± 0.4 eV). The result of this study shows how little changes in the Ca/P ratio had an impact on the granular properties of dried and calcined calcium phosphate materials. Apatite produced with slightly sub-stoichiometric calcium has the potential for promising future uses in the biological, catalytic, and environmental domains.

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Authors and Affiliations

  1. Laboratory of Process and Environmental Engineering (L.P.E.E), Higher School of Technology of Casablanca, Hassan II University, Route del Jadida, Km 7, BP 8012 Oasis, Casablanca, Morocco

    Anass Hatim, Bouchaib Gourich & Younes Abouliatim

  2. Team of Energy, Materials and Environment, Department of Chemistry, Faculty of Sciences, University Chouaib Doukkali, El Jadida, Morocco

    Fatima Abida, Abdelaziz Elouahli & Zineb Hatim

  3. Laboratory Materials, Processes, Environment and Quality, National School of Applied Sciences, Safi, Morocco

    Abdelkrim Abourriche, Abdelaziz Benhammou & Younes Abouliatim

  4. Institute of Research for Ceramics (IRCER), UMR CNRS 7315, European Center of Ceramics, 12 Rue Atlantis, 87068, Limoges, France

    Youssef El Hafiane & Agnès Smith

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  1. Anass Hatim
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  2. Fatima Abida
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  3. Abdelaziz Elouahli
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Anas Hatim, Fatima Abida, Abdelaziz Elouahli, Abdelkrim Abourriche, Abdelaziz Benhammou, Youssef El Hafiane, Bouchaib Gourich, Zineb Hatim, Agnès Smith, and Younes Abouliatim. The first draft of the manuscript was written by Anas Hatim and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Younes Abouliatim.

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Hatim, A., Abida, F., Elouahli, A. et al. Physico-chemical characterization of calcium-apatite prepared with a calcium/phosphate ratio around the stoichiometry. J Aust Ceram Soc 60, 221–230 (2024). https://doi.org/10.1007/s41779-023-00935-2

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