mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal University10.26907/mrsej-23303mrisel-88Research ArticleСтатьиAnalysis of the thermal treatment effects of gadolinium-containing hydroxyapatite by EPR methodDeminaA. Yu.

Moscow 119991

PetrakovaN. V.

Moscow 119991

MurzakhanovF. F.

Kazan 420008

MaminG. V.

Kazan 420008

NikitinaYu. O.

Moscow 119991

SadovnikovaM. A.

Kazan 420008

margaritaasadov@gmail.comAndreevS. O.

Peterhof 198504

ZhukovA. V.

Moscow 125480

GafurovM. R.

Kazan 420008

KomlevV. S.

Moscow 119991

A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of SciencesRussian FederationKazan Federal UniversityRussian FederationSt.Petersburg State UniversityRussian FederationD. Mendeleyev University of Chemical TechnologyRussian Federation20231801202425323303 (11 pp.)Copyright © Demina A.Y., Petrakova N.V., Murzakhanov F.F., Mamin G.V., Nikitina Y.O., Sadovnikova M.A., Andreev S.O., Zhukov A.V., Gafurov M.R., Komlev V.S., 20242024Demina A.Y., Petrakova N.V., Murzakhanov F.F., Mamin G.V., Nikitina Y.O., Sadovnikova M.A., Andreev S.O., Zhukov A.V., Gafurov M.R., Komlev V.S.Demina A.Y., Petrakova N.V., Murzakhanov F.F., Mamin G.V., Nikitina Y.O., Sadovnikova M.A., Andreev S.O., Zhukov A.V., Gafurov M.R., Komlev V.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/88

Hydroxyapatite (HAp)-based materials doped with rare earth elements (REE) have shown applications as biomaterials, lighting emitting materials, scintillating materials, in vivo imaging probes, and thermoluminescent dosimeters. Gadolinium-containing calcium phosphates are promising contrast agents for various bioimaging modalities. In this work, hydroxyapatite materials with gadolinium ion impurities with a 0.44 mol.% concentration were obtained by wet chemical precipitation. Samples after chemical synthesis (as-dried) and heat treatment were studied using electron paramagnetic resonance (EPR) spectroscopy in continuous wave and pulsed modes. Analysis of the EPR spectra made it possible to establish the incorporation of Gd 3+ ions in the structure of HAp in two calcium positions with different parameters of the spin Hamiltonian. Heat treatment of samples at a T = 1300°C leads to a significant change in the EPR spectra of Gd 3+ ions with a decrease of the uncontrolled nitrate anion centers (synthesis by-product) concentration

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The authors declare that there are no conflicts of interest present.