Autor(es): Ortega, Pedro Paulo Silva [UNESP] ; Ramirez, Miguel Angel [UNESP] ; Foschini, César Renato [UNESP] ; Garcia, Filiberto González ; Cilense, Mario [UNESP] ; Simões, Alexandre Zirpoli [UNESP]
Data: 2016
Identificador Persistente: http://hdl.handle.net/11449/135528
Origem: Oasisbr
Assunto(s): Yttrium iron garnet; Powder; Chemical synthesis; Characterization; Magnetic properties
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Instituto Nacional de Ciências dos Materiais em Nanotecnologia (INCTMN)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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 °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.
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Faculdade de Engenharia de Guaratinguetá (FEG), Departamento de Engenharia de Materiais, Guaratinguetá, SP, Brasil
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Faculdade de Engenharia de Guaratinguetá (FEG), Departamento de Materiais e Tecnologia, Guaratinguetá, SP, Brasil
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Faculdade de Engenharia de Bauru (FEB), Departamento de Engenharia Mecânica, Bauru, SP, Brasil
Universidade Federal de Itajubá (UNIFEI), Instituto de Física e Química, Itajubá, MG, Brasil
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Instituto de Química (IQ), Departamento de Química Inorgânica, Araraquara, SP, Brasil
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Faculdade de Engenharia de Guaratinguetá (FEG), Departamento de Engenharia de Materiais, Guaratinguetá, SP, Brasil
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Faculdade de Engenharia de Guaratinguetá (FEG), Departamento de Materiais e Tecnologia, Guaratinguetá, SP, Brasil
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Faculdade de Engenharia de Bauru (FEB), Departamento de Engenharia Mecânica, Bauru, SP, Brasil
Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Instituto de Química (IQ), Departamento de Química Inorgânica, Araraquara, SP, Brasil
CNPq: 573636/2008-7
INCTMN: 2008/57872-1
FAPESP: 2013/07296-2
