This article is cited in 19 papers

Magnetism

Mössbauer investigation of temperature transformations in bacterial ferrihydrite

S. V. Stolyar^ab, O. A. Bayukov^ab, V. P. Ladygina^c, R. S. Iskhakov^ab, L. A. Ishchenko^ab, V. Yu. Yakovchuk^ab, K. G. Dobretsov^d, A. I. Pozdnyakov^b, O. E. Piksina<sup>a

a</sup> Siberian Federal University, Krasnoyarsk
^b L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^c International Research Center for Extreme States of the Organism, Presidium of Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia
^d Railway Clinical Hospital at the Krasnoyarsk station, Joint Stock Company "Russian Railways" (RZhD), Krasnoyarsk, 660021, Russia

Abstract: Ferrihydrite nanoparticles formed as a result of the microorganism activity have been studied using Mössbauer spectroscopy, X-ray powder diffraction analysis, and X-ray fluorescence analysis. Three positions of trivalent iron with nonoverlapping ranges of quadrupole splittings have been revealed in bacterial ferrihydrite: QS$\{$Fe$^{3+}$(1)$\}$ = 0.49–0.83 mm/s, QS$\{$Fe$^{3+}$(2)$\}$ = 0.84–1.10 mm/s, and QS$\{$Fe$^{3+}$(3)$\}$ = 1.25–1.73 mm/s. It has been experimentally demonstrated that the Fe$^{3+}$(3) positions are the centers of nucleation of the hematite phase in the course of heat treatment.

Received: 24.02.2010
Accepted: 15.06.2010

 English version: Physics of the Solid State, 2011, 53:1, 100–104

Bibliographic databases:

•