Y3+ substituted Sr-hexaferrites: sol-gel synthesis, structural, magnetic and electrical characterization
AUTOR(ES)
Satpute, S. S.
FONTE
Cerâmica
DATA DE PUBLICAÇÃO
06/06/2019
RESUMO
Resumo Hexaferritas de estrôncio com adição de Y3+ com composição química SrYxFe12-xO19 (x= 0,0, 0,5, 1,0, 1,5) foram sintetizadas com sucesso pelo método sol-gel com autocombustão. Os estudos estruturais e morfológicos das amostras preparadas foram investigados usando a técnica de difração de raios X, espectroscopia de energia dispersiva, microscopia eletrônica de varredura com emissão de campo (MEV-FEG) e microscopia eletrônica de transmissão de alta resolução. O padrão de difração de raios X confirmou a estrutura hexagonal monofásica da ferrita de estrôncio substituída com ítrio e os parâmetros de rede a e b aumentaram com a substituição dos íons Y3+. O tamanho do cristalito também variou com o teor de x de 60 a 80 nm. A morfologia foi estudada por MEV-FEG e o tamanho de grão das nanopartículas variou de 44 a 130 nm. As propriedades magnéticas foram investigadas usando magnetômetro de amostra vibrante. O valor da magnetização de saturação diminuiu de 49,60 para 35,40 emu/g. A constante dielétrica diminuiu de forma não linear, enquanto a resistividade elétrica CC aumentou com a concentração de ítrio na hexaferrita de estrôncio.Abstract Y3+ substituted strontium hexaferrites having chemical composition SrYxFe12-xO19 (x= 0.0, 0.5, 1.0, 1.5) were successfully synthesized by sol-gel auto-combustion method. The structural and morphological studies of prepared samples were investigated by using X-ray diffraction technique, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy. The X-ray diffraction pattern confirmed the single-phase hexagonal structure of yttrium substituted strontium ferrite and the lattice parameters a and c increased with the substitution of Y3+ ions. The crystallite size also varied with x content from 60 to 80 nm. The morphology was studied by FE-SEM, and the grain size of nanoparticles ranged from 44 to 130 nm. The magnetic properties were investigated by using vibrating sample magnetometer. The value of saturation magnetization decreased from 49.60 to 35.40 emu/g. The dielectric constant decreased non-linearly whereas the electrical dc resistivity increased with the yttrium concentration in strontium hexaferrite.
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