Elemental Analysis of Rare-earth Magnet Utilizing Cathodoluminescence
Elemental Analysis of Rare-earth Magnet Utilizing Cathodoluminescence
复制标题
利用阴极发光对稀土磁体进行元素分析
DOI：
10.1017/s1431927615004766
复制
发表时间：
2015
影响因子：
2.8
通讯作者：
Susumu Imashuku and Jun Kawai
中科院分区：
文献类型：
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作者：
小野 晃一郎;今宿 晋;我妻 和明;Susumu Imashuku and Jun Kawai
绝缘材料和半导体通过电子轰击发出紫外线到红外线区域的光。这种现象被称为阴极发光。CL现象已被应用于许多领域的分析：半导体中缺陷分布的评价，矿物地质史的调查等。特别是含有稀土元素的材料具有很高的发光强度。氯离子分析的检出限低至ppb级。在本研究中，我们尝试应用CL分析法来评价磁体中的稀土元素。我们还尝试用便携式CL光谱仪（我们实现了[1]）对含有稀土元素的磁体从其发光颜色进行分类。由于磁体中稀土元素的成本较高，对磁体中稀土元素的分析对回收利用具有重要意义。本研究分析的样品是一个钐钴磁铁和一个钕磁铁。我们测量氯化磁铁是因为磁铁本身不显示氯化现象。将磁体溶解在35%盐酸中，真空干燥。然后，用我们定制的SEM-CL系统对真空干燥残留物进行测量。SEM- cl系统由常规SEM （JEOL, JSM-5610LVS）、光纤和光谱仪（Ocean optics, QE65Pro）组成。SEM-CL系统的加速电压为15 kV，电子束电流为2 μA。测量持续时间设置为100秒。在测量过程中，SEM-CL系统的一个腔室的压力约为10- 3pa。
Insulating materials and semiconductors emits light in the ultraviolet to infrared region by the bombardment of electrons. This phenomenon is called Cathodoluminescence (CL). CL phenomenon has been applied to analysis in many areas: an evaluation of defect distribution in semiconductor, an investigation of geological history of minerals, and so on. Especially, materials containing rare earth elements have high luminescence intensity. The detection limit of CL analysis is as low as ppb order. In the present study, we tried to apply CL analysis for evaluating rare earth elements in magnets. We also tried to sort magnets containing rare earth elements from their luminescent colors with a portable CL spectrometer we realized [1]. Analysis of rare earth elements in magnets is quite important for recycling due to high cost of rare earth elements.Samples analyzed in the present study were a samarium-cobalt magnet and a neodymium magnet. We measured chloridized magnets because magnets themselves do not show CL phenomenon. The magnets were dissolved in 35% hydrochloric acid (HCl), and the solutions were dried in vacuum. Then, the vacuum-dried residues were measured with a SEM-CL system we customized. The SEM-CL system consisted of conventional SEM (JEOL, JSM-5610LVS), optical fiber, and optical spectrometer (Ocean optics, QE65Pro). The accelerating voltage and electron beam current of the SEM-CL system were set to 15 kV and 2 μA, respectively. Measurement duration was set to 100 seconds. Pressure in a chamber of the SEM-CL system was about 10-3 Pa during the measurement.
利用热释电晶体的小型化分析仪
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
小野 晃一郎;今宿 晋;我妻 和明;Susumu Imashuku and Jun Kawai;今宿 晋，小野 晃一朗，我妻 和明;今宿 晋，小野 晃一朗，我妻 和明;Susumu Imashuku
通讯作者：
Susumu Imashuku