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首页> 外文期刊>Journal of the Ceramic Society of Japan >Effect of particle growth on heat generation ability in AC magnetic field for nano-sized magnetic Y3Fe5O12 powder prepared by bead milling
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Effect of particle growth on heat generation ability in AC magnetic field for nano-sized magnetic Y3Fe5O12 powder prepared by bead milling

机译：珠磨制备纳米Y3Fe5O12磁性纳米粉体中颗粒生长对交流磁场中生热能力的影响

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摘要

A superparamagnetic magnetic Y3Fe5O12 ferrite of 20.5 nm in particle size was prepared by bead milling using 0.05 mmφ beads for 10 h. The heat generation ability in an AC magnetic field (370 kHz, 1.77 kA·m?1) was 0.34 W·g?1 for the bead-milled sample and was improved by calcination at low temperature. The main reason for this heat generation property of the milled samples was ascribed to a Néel relaxation of the superparamagnetic material. The maximum ability of 0.46 W·g?1 in an AC magnetic field (370 kHz, 1.77 kA·m?1) was obtained for the sample (36.8 nm in particle size) calcined at 700°C. The heat generation ability was decreased with particle growth when the calcination temperature was higher than 700°C. For the sample calcined at 600°C, the heat generation ability (W·g?1) was proportional to the square of the magnetic field (H/kA·m?1). In the case of the calcination at 700°C, the heat generation ability (W·g?1) depended on the cube of the magnetic field. The heat generation mechanism would change from superparamagnetic to ferrimagnetic due to the pariticle growth at 700°C.
机译：通过使用0.05mmφ的珠粒进行10 h的珠磨，制备了粒径为20.5 nm的超顺磁磁性Y 3 Fe 5 O 12 铁氧体。珠磨样品在交流磁场（370 kHz，1.77 kA·m ？1 ）中的发热能力为0.34 W·g ？1 ，并且得到了改善通过在低温下煅烧。磨碎样品的这种发热特性的主要原因归因于超顺磁性材料的Néel弛豫。样品（粒子为36.8 nm）在交流磁场（370 kHz，1.77 kA·m ？1 ）中具有0.46 W·g ？1 的最大能力尺寸）在700°C下煅烧。当煅烧温度高于700℃时，生热能力随着颗粒生长而降低。对于在600°C下煅烧的样品，其生热能力（W·g ？1 ）与磁场的平方（H / kA·m ？1 ）。在700℃下煅烧的情况下，发热能力（W·g Δ1）取决于磁场的立方。由于在700°C时粒子的生长，发热机理将从超顺磁性变为亚铁磁性。

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