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Phonon Spectrum in Hydroxyapatite: Calculations and EPR Study at Low Temperatures
Authors
Biktagirov T.
Gafurov M.
+3 more
Iskhakova K.
Mamin G.
Orlinskii S.
Publication date
1 March 2020
Publisher
Abstract
© 2015, Springer Science+Business Media New York.Density functional theory-based calculations within the framework of the plane-wave pseudopotential approach are carried out to define the phonon spectrum of hydroxyapatite Ca10(PO4)6(OH)2 (HAp). It allows to describe the temperature dependence of the electronic spin-lattice relaxation time T 1e of the radiation-induced stable radical NO32- in HAp, which was measured in X-band (9 GHz, magnetic field strength of 0.34 T) in the temperature range T = (10–300) K. It is shown that the temperature behavior of T1e at T> 20 K can be fitted via two-phonon Raman type processes with the Debye temperature ΘD≈280K evaluated from the phonon spectrum
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Last time updated on 04/04/2020