Yttrium-iron garnet and yttrium orthoferrite nanocrystals:Hydrothermal synthesis, magnetic property and phase transformation study
来源期刊：JOURNAL OF RARE EARTHS2018年第12期
论文作者：Mohammadreza Mansournia Mahsa Orae
文章页码：1292 - 1298
摘 要：In this work,we present a new and fast method to obtain the single phase Y3 Fe5 O12（YIG,cubic） and YFeO3（YIP, orthorhombic） nanocrystals based on hydrothermal technique. The influence of initial Y/Fe mole ratio and calcination temperature on the nature, purity, phase structure, and morphology of the product was investigated by X-ray diffraction（XRD）, Fourier-transform infrared（FT-IR） spectroscopy,energy-dispersive（EDX） X-ray spectroscopy, and field emission scanning electron microscopy（FESEM）.The results show that the transformation of the as-synthesized YIG from amorphous to orthorhombic and finally to cubic phase occurs with the increase of annealing temperature. On this basis, the pure cubic phase YIG can be obtained by calcination（at 1100℃） of the precursor which is prepared using the hydrothermal treatment of mole ratio of Y:Fe = 1:1.5 exposure to an ammonia atmosphere. Also, the initial Y/Fe mole ratio of 1:1 and calcination temperature of 1000 ℃ are the optimal conditions to form single-phase nanocrystalline YIP. Further, vibrating sample magnetometry（VSM） measurements illustrate the average magnetic saturation, coercivity and remanence of 2.73 and 15.00 emu/g, 42.74 and40.02 Oe, and 1.65 and 4.30 emu/g for YIP and YIG nanocrystals, revealing their soft ferromagnetic character.
Mohammadreza Mansournia，Mahsa Orae
Department of Inorganic Chemistry Faculty of Chemistry,University of Kashan
摘 要：In this work,we present a new and fast method to obtain the single phase Y3 Fe5 O12（YIG,cubic） and YFeO3（YIP, orthorhombic） nanocrystals based on hydrothermal technique. The influence of initial Y/Fe mole ratio and calcination temperature on the nature, purity, phase structure, and morphology of the product was investigated by X-ray diffraction（XRD）, Fourier-transform infrared（FT-IR） spectroscopy,energy-dispersive（EDX） X-ray spectroscopy, and field emission scanning electron microscopy（FESEM）.The results show that the transformation of the as-synthesized YIG from amorphous to orthorhombic and finally to cubic phase occurs with the increase of annealing temperature. On this basis, the pure cubic phase YIG can be obtained by calcination（at 1100℃） of the precursor which is prepared using the hydrothermal treatment of mole ratio of Y:Fe = 1:1.5 exposure to an ammonia atmosphere. Also, the initial Y/Fe mole ratio of 1:1 and calcination temperature of 1000 ℃ are the optimal conditions to form single-phase nanocrystalline YIP. Further, vibrating sample magnetometry（VSM） measurements illustrate the average magnetic saturation, coercivity and remanence of 2.73 and 15.00 emu/g, 42.74 and40.02 Oe, and 1.65 and 4.30 emu/g for YIP and YIG nanocrystals, revealing their soft ferromagnetic character.
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