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Hematite (α-Fe2O3) pure and doped with Eu3+ obtained by high-energy ball milling process

Stanhaus, Cristian ; Alves, Lorena L.S. ; Ferrari, Jefferson L. ; Padilha, Janine C. ; Góes, Márcio Sousa

Materials chemistry and physics, 2020-11, Vol.254, p.123385, Article 123385 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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  • Título:
    Hematite (α-Fe2O3) pure and doped with Eu3+ obtained by high-energy ball milling process
  • Autor: Stanhaus, Cristian ; Alves, Lorena L.S. ; Ferrari, Jefferson L. ; Padilha, Janine C. ; Góes, Márcio Sousa
  • Assuntos: Ball milling ; Crystallites ; Emission ; Europium ; Europium compounds ; Europium doping ; Hematite ; Hematite (α-Fe2O3) ; High-energy ball milling ; Iron oxides ; Luminescence ; Photoluminescence ; Raw materials ; Rietveld refinements ; Unit cell
  • É parte de: Materials chemistry and physics, 2020-11, Vol.254, p.123385, Article 123385
  • Descrição: The α-Fe2O3:Eu3+ powders were prepared by high-energy ball milling using Fe(OO)H and Eu2O3 as raw materials. The Fe(OO)H and Eu2O3 powders were subjected to dry milling for 15, 30 and 45 h. The Rietveld refinements results showed that after 45 h of milling the materials obtained were α-Fe2O3 with 100 wt.% purity for the sample without Eu2O3, and 98.25 wt.% and 93.82 wt.% for the samples with 5 and 10 wt.% Eu2O3, respectively. The unit cell volume was greater for the samples with Eu2O3 (<2 Å). The crystallite size decreased and the microstrains increased with a longer milling time, probably due to the Eu3+ concentration. The BET analysis revealed a 25% increase in the surface area for the sample with 10 wt.% Eu2O3. The materials containing Eu3+ showed photoluminescence in the visible range, between 550 and 735 nm with a band of emission assigned to the f-f transitions of the Eu3+ ion. The most intense band emission with a maximum of around 612 nm is assigned to the 5D0 → 7F2 of Eu3+, making this material an interesting absorber in the UV-VIS region with intense emission in the visible region due to the downshifting emission mechanism. •α-Fe2O3 pure and doped were prepared by high-energy ball milling process.•Samples containing Eu2O3, the phase transition occurred slowly, confirmed by XRD and Rietveld Method.•Crystallite size decrease and microstrains increase with improvement milled time.•Photoluminescent material based on Eu3+ doped α-Fe2O3 with 5 wt% Eu2O3.
  • Editor: Lausanne: Elsevier B.V
  • Idioma: Inglês
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