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The effect of Y3+ substitution on the structural, optical band-gap, and magnetic properties of cobalt ferrite nanoparticles

Alves, T. E. P ; Pessoni, H. V. S ; Franco Jr, A

Physical chemistry chemical physics : PCCP, 2017-06, Vol.19 (25), p.16395-1645 [Periódico revisado por pares]

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  • Título:
    The effect of Y3+ substitution on the structural, optical band-gap, and magnetic properties of cobalt ferrite nanoparticles
  • Autor: Alves, T. E. P ; Pessoni, H. V. S ; Franco Jr, A
  • Assuntos: Cobalt ferrites ; Combustion ; Energy gaps (solid state) ; Magnetic properties ; Nanoparticles ; Nanostructure ; Optical properties ; Yttrium
  • É parte de: Physical chemistry chemical physics : PCCP, 2017-06, Vol.19 (25), p.16395-1645
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: In this study we investigated the structural, optical band-gap, and magnetic properties of CoY x Fe 2− x O 4 (0 ≤ x ≤ 0.04) nanoparticles (NPs) synthesized using a combustion reaction method without the need for subsequent heat treatment or the calcing process. The particle size measured from X-ray diffraction (XRD) patterns and transmission electron microscope (TEM) images confirms the nanostructural character in the range of 16-36 nm. The optical band-gap ( E g ) values increase with the Y 3+ ion ( x ) concentration being 3.30 and 3.58 eV for x = 0 and x = 0.04, respectively. The presence of yttrium in the cobalt ferrite (Y-doped cobalt ferrite) structure affects the magnetic properties. For instance, the saturation magnetization, M s and remanent magnetization, M r , decrease from 69 emu g −1 to 33 and 28 to 12 emu g −1 for x = 0 and x = 0.04, respectively. On the other hand the coercivity, H c , increases from 1100 to 1900 Oe for x = 0 and x = 0.04 at room temperature. Also we found that M s , M r , and H c decreased with increasing temperature up to 773 K. The cubic magnetocrystalline constant, K 1 , determined by using the "law of approach" (LA) to saturation decreases with Y 3+ ion concentration and temperature. K 1 values for x = 0 ( x = 0.04) were 3.3 × 10 6 erg cm −3 (2.0 × 10 6 erg cm −3 ) and 0.4 × 10 6 erg cm −3 (0.3 × 10 6 erg cm −3 ) at 300 K and 773 K, respectively. The results were discussed in terms of inter-particle interactions induced by thermal fluctuations, and Co 2+ ion distribution over tetrahedral A-sites and octahedral B-sites of the spinel structure due to Y 3+ ion substitution. In this study we investigated the structural, optical band-gap, and magnetic properties of CoY x Fe 2− x O 4 (0 ≤ x ≤ 0.04) nanoparticles (NPs) synthesized using a combustion reaction method without the need for subsequent heat treatment or the calcing process.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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