Synthesis, structure and magnetic properties of Y3Fe5-xAlxO12 garnets prepared by the soft chemical method

Author(s)

Silva Ortega, Pedro Paulo ^[1] ; Ramirez, Miguel Angel ^[1] ; Foschini, Cesar Renato ^[2] ; Garcia, Filiberto Gonzalez ^[3] ; Cilense, Mario ^[4] ; Simoes, Alexandre Zirpoli ^[1]

Affiliation

^[1] Univ Estadual Paulista Unesp, Fac Engn Guaratingueta, Ave Dr Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP - Brazil

^[2] Univ Estadual Paulista UNESP, Fac Engn Bauru, Dept Engn Mecan, BR-17033360 Bauru, SP - Brazil

^[3] Univ Fed Itajuba, Inst Fis & Quim, BR-37500903 Minas Gerais, MG - Brazil

^[4] Univ Estadual Paulista Unesp, Inst Quim, Lab Interdisciplinar Ceram LIEC, BR-1480090 Araraquara, SP - Brazil

• Document type: Journal article
• Source: PROCESSING AND APPLICATION OF CERAMICS; v. 8, n. 4, p. 211-218, 2014.
• Web of Science Citations: 4

Abstract

A study was undertaken about the structural, morphological and magnetic properties at room temperature of crystalline aluminium substituted yttrium iron garnet, YIG (Y3Fe5-xAlxO12 with 1.5 < x < 1.7) nanoparticles prepared by polymeric precursor method at the temperature of 700 degrees C for 2 hours. The single-phase character and the well-defined structure of YIG nanoparticles were confirmed by X-ray diffraction, excluding the presence of any other phases. The Raman spectra showed that the changes of lattice vibration would influence interaction between the Fe ion and the host. Mean crystallite size of the single-phase powder was about 46-65 nm. Particles' morphology was investigated by high-resolution transmission electron microscopy, which shows that the particles were agglomerated. From hysteresis loops, particles' efficiency range from 91.4% to 95.9% as Fe/Al ratio decreases. Saturation magnetization was affected by the particle size and Fe/Al stoichiometric ratio. We observe that the saturation magnetization increases as the Fe/Al ratio is raised due to enhancement of the surface spin effects. (AU)

• FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC