Low-temperature Mossbauer studies of the phase composition and structural stability of iron (III) oxide/hydroxide nanocomposite

  • B.K. Ostafiychuk G.V. Kurdyumov Institute for Metal Physics N.A.S. of Ukraine; Vasyl Stefanyk Precarpathian National University
  • V.V. Moklyak G.V. Kurdyumov Institute for Metal Physics N.A.S. of Ukraine
  • V.D. Fedoriv Vasyl Stefanyk Precarpathian National University
  • A.B. Hrubiak G. V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine
  • Yu.V. Yavorskyi National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
  • S.O. Yuryev Lviv Polytechnic National University
Keywords: iron (III) oxide/hydroxide nanocomposite, Mossbauer, magnetically ordered and paramagnetic components, Zeeman splitting, effective magnetic field

Abstract

In article present the results of low-temperature Mossbauer studies of iron (III) oxide/hydroxide nanocomposite synthesized by the method of deposition. Based on these studies, the composition of the synthesized composite was revealed. The nanodispersed composite with a specific surface 280 m2/g is a hematite in the weakly disordered crystalline state (CSR 10 nm), and a lepidocrocite in the X-ray amorphous state (particles size 3-4 nm). The relative integral intensity of the Zeeman sextet, which corresponds to the magnetically ordered phase of hematite, is practically unchanged and is about 17%. The tendency to divide the magnetically ordered component into two sextets, which differ in quadrupole splitting QS= –0.21 mm/s and QS= 0.21 mm/s, respectively, is observed starting from a temperature of 190 K. As a result of annealing of the synthesized material at a temperature of 200°C, a slight redistribution (≈ 5%) of the content of paramagnetic and magnetically ordered components was recorded, which indicates the structural stability of the nanoparticles of the lepidocrocite γ-FeOOH phase at this temperature. Increase of  annealing temperatures to 500oC leads to the predicted course of the phase transition γ-FеООH ® α-Fе2О3. The mechanism of growth of hematite crystallites during sintering due to fixation side faces of larger α-Fe2O3 phase of nanoparticles of the γ-FeOOH phase with simultaneous transformation of their crystal structure to side faces of larger α-Fe2O3 phase particles is presented.

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Published
2021-05-26
How to Cite
[1]
OstafiychukB., MoklyakV., FedorivV., HrubiakA., YavorskyiY. and YuryevS. 2021. Low-temperature Mossbauer studies of the phase composition and structural stability of iron (III) oxide/hydroxide nanocomposite. Physics and Chemistry of Solid State. 22, 2 (May 2021), 307-312. DOI:https://doi.org/10.15330/pcss.22.2.307-312.
Section
Scientific articles (Physics)