Crystal structure, dielectric and optical properties of β-Ca3(PO4)2-type phosphates Ca9-Zn La(PO4)7:Ho3+
| Autor: | O. V. Baryshnikova, Kirill N. Boldyrev, Yu. Yu. Dikhtyar, Dina V. Deyneko, V.А. Morozov, А.А. Belik, Bogdan I. Lazoryak |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Biophysics Phosphor 02 engineering and technology General Chemistry Crystal structure Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences Dielectric spectroscopy Crystal Crystallography Differential scanning calorimetry 0210 nano-technology Spectroscopy Luminescence |
| Zdroj: | Journal of Luminescence. 236:118083 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2021.118083 |
| Popis: | A series of new phosphates Ca9-xZnxLa(PO4)7:Ho3+ with the β-Ca3(PO4)2-type structure was synthesized by the solid state route. An intense near infra-red (NIR) emission according to intraconfigural 4f-4f transitions of Ho3+ ions 5I7 – 5I8 (~2 μm) and 5I6 – 5I8 (~1.156 μm) was observed. The obtained phases were studied by a combination of methods including synchrotron powder X-ray diffraction, dielectric spectroscopy, second harmonic generation, differential scanning calorimetry, luminescence spectroscopy. The structure of Ca8ZnLa(PO4)7 was refined by the Rietveld method in centrosymmetric space group R 3 ‾ c. The Ca2+ → Zn2+ substitution in the M5 site leads to a transformation from polar R3c space group (x = 0 – 0.5) to centrosymmetric R 3 ‾ c space group (x = 0.6–1) and to the increased integral intensity of luminescence with maxima at x = 1. It was concluded that the crystal site engineering in the Ho3+-containing β-Ca3(PO4)2-type hosts offers a promising way to obtain new NIR phosphors for use in the creation of biocompatible bone tissue fillers. |
| Databáze: | OpenAIRE |
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