A study of hydroxyapatite nanocrystals by the multifrequency EPR and ENDOR spectroscopy methods

Авторы: Biktagirov T.B., Gafurov M.R., Mamin G.V., Orlinskii S.B., Yavkin B.V., Rodionov A.A., Klimashina E.S., Putlyaev V.I., Fillipov Ya Yu
Журнал: Optics and Spectroscopy (English translation of Optika i Spektroskopiya), издательство Optical Society of America (United States)
Том: 116
Номер: 5
Год издания: 2014
Первая страница: 715
Последняя страница: 720
DOI: 10.1134/S0030400X14050051
Аннотация: Specimens of powders of hydroxyapatite (Ca10(PO4)6(OH)2) with average crystallite sizes in the range of 20–50 nm synthesized by the wet precipitation method have been investigated by the multifrequency (9 and 94 GHz) electron paramagnetic resonance (EPR) and electron–nuclear double resonance (ENDOR) methods. In specimens subjected to Xray irradiation at room temperature, EPR signals that are caused by nitrogen compounds have been observed. Numerical calculations performed in terms of the density functional theory show that the observed EPR signal is caused by the occurrence of paramagnetic centers, the structure of which is NO and which replace the positions of PO in the hydroxyapatite structure.
Добавил в систему: Климашина Елена Сергеевна

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