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微波磁场辐照降低居里温度附近固体结晶磁铁矿的微晶直径

Decrease in the Crystallite Diameter of Solid Crystalline Magnetite around the Curie Temperature by Microwave Magnetic Fields Irradiation.

作者信息

Tsuchida Takayuki, Fukushima Jun, Takizawa Hirotsugu

机构信息

School of Engineering, Department of Applied Chemistry, Tohoku University, Sendai 980-8578, Japan.

出版信息

Nanomaterials (Basel). 2021 Apr 11;11(4):984. doi: 10.3390/nano11040984.

DOI:10.3390/nano11040984
PMID:33920397
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8069712/
Abstract

A decrease in the crystallite diameter of ferrites irradiated with microwaves has been considered as a non-thermal effect of so-called de-crystallization; however, its mechanism has not been elucidated. We hypothesized that a decrease in the crystallite diameter is caused by interaction between the ordered spins of ferrite and the magnetic field of microwaves. To verify this, we focused on magnetite with a Curie temperature of 585 °C. Temperature dependence around this temperature and time dependence of the crystallite diameter of the magnetite irradiated with microwaves at different temperatures and durations were investigated. From the X-ray diffraction data, the crystallite diameter of magnetite exhibited a minimum value at 500 °C, just below the Curie temperature of magnetite, where the energy loss of the interaction between magnetite's spins and the microwaves takes the maximum value. The crystallite diameter exhibited a minimum value at 5 min irradiation time, during which the microwaves were excessively absorbed. Transmission electron microscopy observations showed that the microstructure of irradiated magnetite in this study was different from that reported previously, indicating that a decrease in the crystallite diameter is not caused by de-crystallization but its similar phenomenon. A decrease in coercivity and lowering temperature of Verwey transition were observed, evidencing decreased crystallite diameter. This study can thus contribute to the development of the theory of a non-thermal effect.

摘要

微波辐照铁氧体时微晶直径的减小被认为是所谓的去结晶化的非热效应；然而，其机制尚未阐明。我们假设微晶直径的减小是由铁氧体有序自旋与微波磁场之间的相互作用引起的。为了验证这一点，我们聚焦于居里温度为585℃的磁铁矿。研究了该温度附近的温度依赖性以及在不同温度和持续时间下微波辐照的磁铁矿微晶直径的时间依赖性。根据X射线衍射数据，磁铁矿的微晶直径在500℃时呈现最小值，该温度刚好低于磁铁矿的居里温度，此时磁铁矿自旋与微波之间相互作用的能量损失达到最大值。在辐照5分钟时微晶直径呈现最小值，在此期间微波被过度吸收。透射电子显微镜观察表明，本研究中辐照磁铁矿的微观结构与先前报道的不同，这表明微晶直径的减小不是由去结晶化引起的，而是其类似现象。观察到矫顽力降低和韦尔维转变温度降低，证明微晶直径减小。因此，本研究有助于非热效应理论的发展。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/4ea57883659e/nanomaterials-11-00984-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/c330504311a0/nanomaterials-11-00984-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/e81867ffc183/nanomaterials-11-00984-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/1146d56fadbe/nanomaterials-11-00984-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/0c5b990ea2ea/nanomaterials-11-00984-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/d6a961d8d30a/nanomaterials-11-00984-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/2654ed575c29/nanomaterials-11-00984-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/4ea57883659e/nanomaterials-11-00984-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/c330504311a0/nanomaterials-11-00984-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/e81867ffc183/nanomaterials-11-00984-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/1146d56fadbe/nanomaterials-11-00984-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/0c5b990ea2ea/nanomaterials-11-00984-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/d6a961d8d30a/nanomaterials-11-00984-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/2654ed575c29/nanomaterials-11-00984-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2bfa/8069712/4ea57883659e/nanomaterials-11-00984-g007.jpg

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