Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Synthesis and characterization of yttrium iron garnet nanoparticles doped with cobalt

2018; Elsevier BV; Volume: 44; Issue: 10 Linguagem: Inglês

10.1016/j.ceramint.2018.03.179

1873-3956

R. Peña‐Garcia, Y. Guerra, D. Martínez Buitrago, Lívio Rodrigues Leal, Francisco Eroni Paz dos Santos, E. Padrón‐Hernández,

Photonic Crystals and Applications

In this work, we have synthesized and characterized yttrium iron garnet nanoparticles doped with cobalt. The X-ray diffraction data showed a single phase, belonging to the cubic structure of Y3Fe5O12. Rietveld refinement revealed variation of the angles and interionic distances (Fe3+(a)-O2-Y3+(c) and Fe3+(d)-O2--Y3+(c) when Fe3+ ions are replaced by Co3+ ions in the tetrahedral (d) and octahedral (a) sites of YIG. In addition, the lattice parameter a, decreases from 12.3846 Å to 12.3830 Å with the increasing of cobalt concentration. The analysis by Infrared and Raman spectroscopies has shown a slight stretching at lower wave numbers as the dopant concentration increased. The magnetic measurements confirm the substitution of Fe3+ by Co3+ in the a-sites and d-sites with the reduction of the saturation magnetization from 26.63 emu/g to 24.92 emu/g, for 0.000 ≤ y ≤ 0.030. Changes in the coercive field varying the dopant concentration were related to the particle size and pinning centers existence.