Study of radiation-induced stable radicals in synthetic octacalcium phosphate by pulsed EPR
https://doi.org/10.26907/mrsej-19105
Abstract
Created at room temperature by X-ray irradiation at the dose of about 5 kGy radiation-induced centers in stable octacalcium phosphate (OCP) powders obtained by double transformation of α-tricalcium phosphate (TCP) are studied by means of pulsed electron paramagnetic resonance (EPR). No EPR signals within the sensitivity of the used equipment in the non-irradiated samples were detected. In the irradiated species complex EPR spectrum signals appeared. Three types of the paramagnetic centers are decomposed in the investigated samples. Their spectroscopic parameters (components of g-factors and hyperfine constants) are defined. Based on the extracted parameters two of them are ascribed to CO2− and NO32− radicals while the nature of the third one is still questionable. The spectroscopic parameters of NO32− stable radical is found to be differ than these for TCP or hydroxyapatite. The obtained results could be used for the tracing of the mineralization processes from its initiation to the completion of the final product and for the identification of the OCP phase.
Supporting agencies: This work was supported by Russian Foundation for Basic Research (RFBR), grant # 18-29-11086.
About the Authors
D. Shurtakova
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
B. Yavkin
Kazan Federal University; Physikalisches Institut, University of Stuttgart
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008; Pfaffenwaldring 57, Stuttgart 70569, Germany
M. Gafurov
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
G. Mamin
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
S. Orlinskii
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
L. Kuznetsova
Kazan State University of Architecture and Engineering
Russian Federation
Russian Federation
Zelenaya 1, Kazan 420043
S. Bakhteev
Kazan National Research Technological University
Russian Federation
Russian Federation
K. Marx Str. 41, Kazan 420015
I. Ignatyev
Interregional Clinical Diagnostic Centre
Russian Federation
Russian Federation
Karbysheva 12a, Kazan 420101
I. Smirnov
A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky Pr. 49, Moscow 119991
A. Fedotov
A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky Pr. 49, Moscow 119991
V. Komlev
A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky Pr. 49, Moscow 119991
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Review
For citations:
Shurtakova D., Yavkin B., Gafurov M., Mamin G., Orlinskii S., Kuznetsova L., Bakhteev S., Ignatyev I., Smirnov I., Fedotov A., Komlev V. Study of radiation-induced stable radicals in synthetic octacalcium phosphate by pulsed EPR. Magnetic Resonance in Solids. 2019;21(1):19105 (7 pp.). https://doi.org/10.26907/mrsej-19105
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