Synthesis and characterization of yttrium iron garnet nanoparticles doped with cobalt. Issue 10 (July 2018)

• Record Type: Journal Article
• Authors: Peña-Garcia, R.; Guerra, Y.; Buitrago, D. Martínez; Leal, L.R.F.; Santos, F.E.P.; Padrón-Hernández, E.
• Is Part Of: Ceramics international. Volume 44:Issue 10(2018)
• Page Start: 11314
• Page End: 11319
• Publication Date: 2018-07
• Subjects: Sol gel -- FTIR -- Raman -- YIG -- Rietveld refinement; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.03.179
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 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 Y3 Fe5 O12 . Rietveld refinement revealed variation of the angles and interionic distances (Fe 3+ ( a )-O 2- Y 3+ ( c ) and Fe 3+ ( d )-O 2- -Y 3+ ( c ) when Fe 3+ ions are replaced by Co 3+ 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 Fe 3+ by Co 3+ 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.