| Autor: |
Carrera, Karime, Huerta, Verónica, Orozco, Victor, Matutes, José, Urbieta, Ana, Fernández, Paloma, Martínez, Fabián, Graeve, Olivia A., Herrera, Manuel |
| Zdroj: |
Biomedical Materials & Devices; 20240101, Issue: Preprints p1-16, 16p |
| Abstrakt: |
We demonstrate that doping hydroxyapatite (HAp) with Cr3+ions induces oxygen vacancies, contributing to paramagnetism. Cathodoluminescence and photoluminescence analyses reveal increased oxygen vacancy formation in OH-and PO43-groups with rising Cr3+concentrations, highlighted by stronger cathodoluminescence emissions at 2.57 and 2.95 eV and the photoluminescence emission at 3.32 eV. Raman spectroscopy shows new modes at 900 and 970 cm−1, indicating distortion of the v1vibrational mode due to Cr3+substitution at Ca(II) sites of the HAp lattice. X-ray photoelectron spectroscopy confirms Cr3+in the HAp:Cr. Magnetometry reveals a shift from diamagnetism in pure HAp to increasing paramagnetism in HAp:Cr with higher Cr3+content, achieving 0.0460 emu/g at 10 kOe with concentrations higher than 2.9 at.%. This paramagnetism is attributed to Cr3+ions and singly ionized oxygen vacancies VO′aligning along an external magnetic field, with VO′formation linked to PO43-replacement by PO32-in HAp. |
| Databáze: |
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