Structural analysis of magnetic nanocrystals embedded in silicate glasses by anomalous small-angle X-ray scattering

Vikram Singh Raghuwanshi, Dragomir Tatchev, Sylvio Haas, Ruzha Harizanova, Ivailo Gugov, Christian Rüssel, Armin Hoell

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The present work reports the structural analysis of magnetic nanocrystals of Fe-and Mn-containing phases formed during annealing of the glass 13.6Na2O-62.9SiO2-8.5MnO-15.0Fe2O3-x (mol%) at 823 K for different periods of time. X-ray diffraction investigation shows the formation of a mixture of MnFe2O4 and Fe3O4 phases. Furthermore, small-angle X-ray scattering and anomalous small-angle X-ray scattering (ASAXS) experiments were used to extract quantitative information about the structure of the formed nano-sized crystals, as well as their phase compositions, volume fractions and size distributions. ASAXS analysis reveals the formation of spherical core-shell particles with the size of the particles between 10 and 50 nm. The concentrations of iron atoms in the core are higher than those in the shell and in the remaining matrix. With increasing annealing time, the ratio of Mn to Fe increases in the nanoparticles and the crystalline phase moves toward the pure jacobsite phase. Evaluated compositions reveal the presence of SiO2 in the shell. This shell acts as a diffusion barrier for the nanocrystal-forming ions, and the growth of the particles is kinetically constrained.

Original languageEnglish
Pages (from-to)644-651
Number of pages8
JournalJournal of Applied Crystallography
Volume45
Issue number4
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Keywords

  • anomalous small-angle X-ray scattering
  • glasses
  • nanocrystallization
  • nanostructure
  • small-angle X-ray scattering

Cite this

Raghuwanshi, Vikram Singh ; Tatchev, Dragomir ; Haas, Sylvio ; Harizanova, Ruzha ; Gugov, Ivailo ; Rüssel, Christian ; Hoell, Armin. / Structural analysis of magnetic nanocrystals embedded in silicate glasses by anomalous small-angle X-ray scattering. In: Journal of Applied Crystallography. 2012 ; Vol. 45, No. 4. pp. 644-651.
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abstract = "The present work reports the structural analysis of magnetic nanocrystals of Fe-and Mn-containing phases formed during annealing of the glass 13.6Na2O-62.9SiO2-8.5MnO-15.0Fe2O3-x (mol{\%}) at 823 K for different periods of time. X-ray diffraction investigation shows the formation of a mixture of MnFe2O4 and Fe3O4 phases. Furthermore, small-angle X-ray scattering and anomalous small-angle X-ray scattering (ASAXS) experiments were used to extract quantitative information about the structure of the formed nano-sized crystals, as well as their phase compositions, volume fractions and size distributions. ASAXS analysis reveals the formation of spherical core-shell particles with the size of the particles between 10 and 50 nm. The concentrations of iron atoms in the core are higher than those in the shell and in the remaining matrix. With increasing annealing time, the ratio of Mn to Fe increases in the nanoparticles and the crystalline phase moves toward the pure jacobsite phase. Evaluated compositions reveal the presence of SiO2 in the shell. This shell acts as a diffusion barrier for the nanocrystal-forming ions, and the growth of the particles is kinetically constrained.",
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Structural analysis of magnetic nanocrystals embedded in silicate glasses by anomalous small-angle X-ray scattering. / Raghuwanshi, Vikram Singh; Tatchev, Dragomir; Haas, Sylvio; Harizanova, Ruzha; Gugov, Ivailo; Rüssel, Christian; Hoell, Armin.

In: Journal of Applied Crystallography, Vol. 45, No. 4, 08.2012, p. 644-651.

Research output: Contribution to journalArticleResearchpeer-review

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