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Re-formation of metastable epsilon-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties

Само за регистроване кориснике
2017
1555.pdf (2.959Mb)
Аутори
Nikolić, Violeta N.
Spasojević, Vojislav
Panjan, Matjaž
Kopanja, Lazar
Mraković, Ana Đ.
Tadić, Marin
Чланак у часопису
Метаподаци
Приказ свих података о документу
Апстракт
Several Fe2O3/SiO2 nanostructures were synthesized by the combination of the microemulsion and a sol-gel methods. Based on X-ray powder diffraction (XRD) and magnetic measurements (giant coercivity similar to 2.13 T) we identified epsilon-Fe2O3 (hard magnet) as the dominant crystalline phase. TEM analysis showed a wide size distribution of iron oxide nanoparticles (from 4 to 50 nm) with various morphologies (spherical, ellipsoidal and rod-like). We quantitatively described (computational analysis, MATLAB code) morphological properties of nanoparticles using the ellipticity of the shapes. The as-synthesized hard magnetic material was subjected to a post-annealing treatment at different temperatures (200, 500, 750, 1000 and 1100 degrees C) in order to investigate stability, formation and transformation of the epsilon-Fe2O3 polymorph. We found decreasing coercivity in the thermally treated samples up to the temperature of 750 degrees C (H-c=1245 Oe), followed by an observation of a surpri...sing jump in coercivity H-c similar to 1.5 T after post-annealing at 1000 degrees C. We conclude that the re-formation of the epsilon-Fe2O3 structure during post-annealing at 1000 degrees C is the origin of the observed phenomena. The phase transformation epsilon-Fe2O3 - GT alpha-Fe2O3 and crystallization of amorphous silica in quartz and cristobalite were observed in the sample treated at 1100 degrees C.

Кључне речи:
Sol-gel synthesis / epsilon-Fe2O3 / Magnetic properties / Phase transformation / Maghemite (gamma-Fe2O3) / Hematite (alpha-Fe2O3)
Извор:
Ceramics International, 2017, 43, 10, 7497-7507
Пројекти:
  • Магнетни и радионуклидима обележени наноструктурни материјали за примене у медицини (RS-45015)
  • Serbian-Slovenian bilateral project [BI-RS/16-17-030]

DOI: 10.1016/j.ceramint.2017.03.030

ISSN: 0272-8842 (print); 1873-3956 (electronic)

WoS: 000400880000017

Scopus: 2-s2.0-85014838558
[ Google Scholar ]
URI
http://vinar.vin.bg.ac.rs/123456789/1559
Колекције
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Институција
Vinča

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