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Structure and magnetic properties of BeO-Fe2O3-Al2O3-TeO2 glass-ceramic composites

Wójcik, N.A. ; Tagiara, N.S. ; Ali, S. ; Górnicka, K. ; Segawa, H. ; Klimczuk, T. ; Jonson, B. ; Möncke, D. ; Kamitsos, E.I.

Journal of the European Ceramic Society, 2021-08, Vol.41 (10), p.5214-5222 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Structure and magnetic properties of BeO-Fe2O3-Al2O3-TeO2 glass-ceramic composites
  • Autor: Wójcik, N.A. ; Tagiara, N.S. ; Ali, S. ; Górnicka, K. ; Segawa, H. ; Klimczuk, T. ; Jonson, B. ; Möncke, D. ; Kamitsos, E.I.
  • Assuntos: Beryllium-iron-tellurite glasses ; IR spectroscopy ; Magnetic properties ; Raman spectroscopy ; Spin-glass
  • É parte de: Journal of the European Ceramic Society, 2021-08, Vol.41 (10), p.5214-5222
  • Descrição: •Preparation of Be-Fe-Te-Al-O glass-ceramic composites.•The support of Fe2O3 crystallization process due to BeO addition.•The increase in the polymerization of tellurite glass network by doping with BeO.•The magnetic properties typical for spin glasses.•The observation of Morin transition only for beryllium-doped samples. In this work, glass-ceramics in the xBeO–20Fe2O3–(80-x)TeO2 system with x = 0–25 mol% were synthesized by the traditional melt quenching route and studied by inductively coupled plasma optical emission spectroscopy, X-ray diffraction, confocal microscopy, infrared and Raman spectroscopy. BeO addition was found to support the crystallization process of Fe2O3 during melting, and an increased BeO content was associated with an increased fraction of the crystalline Fe2O3 phase and an increased size of these crystallites. Furthermore, samples doped with BeO exhibit an increasing polymerization of the residual tellurite glass network compared to the undoped sample. The magnetic properties and specific heat of all synthesized materials were measured, and the results show that all studied samples behave as spin-glasses. Also, the Morin transition of hematite was observed at 260 K with intensity depending on the material content in Fe2O3 crystalline phase, the formation of which correlates with the amount of added BeO.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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