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Scanning Electron Microscope-Cathodoluminescence Analysis of Rare-Earth Elements in Magnets

Published online by Cambridge University Press:  07 January 2016

Susumu Imashuku ,
Kazuaki Wagatsuma  and
Jun Kawai
Susumu Imashuku*
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Kazuaki Wagatsuma
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Jun Kawai
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
*
*Corresponding author.[email protected]
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Abstract

Scanning electron microscope-cathodoluminescence (SEM-CL) analysis was performed for neodymium–iron–boron (NdFeB) and samarium–cobalt (Sm–Co) magnets to analyze the rare-earth elements present in the magnets. We examined the advantages of SEM-CL analysis over conventional analytical methods such as SEM-energy-dispersive X-ray (EDX) spectroscopy and SEM-wavelength-dispersive X-ray (WDX) spectroscopy for elemental analysis of rare-earth elements in NdFeB magnets. Luminescence spectra of chloride compounds of elements in the magnets were measured by the SEM-CL method. Chloride compounds were obtained by the dropwise addition of hydrochloric acid on the magnets followed by drying in vacuum. Neodymium, praseodymium, terbium, and dysprosium were separately detected in the NdFeB magnets, and samarium was detected in the Sm–Co magnet by the SEM-CL method. In contrast, it was difficult to distinguish terbium and dysprosium in the NdFeB magnet with a dysprosium concentration of 1.05 wt% by conventional SEM-EDX analysis. Terbium with a concentration of 0.02 wt% in an NdFeB magnet was detected by SEM-CL analysis, but not by conventional SEM-WDX analysis. SEM-CL analysis is advantageous over conventional SEM-EDX and SEM-WDX analyses for detecting trace rare-earth elements in NdFeB magnets, particularly dysprosium and terbium.

Keywords

neodymium-iron-boron magnetrare earth elementsamarium-cobalt magnetSEM-CL
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 22 , Issue 1 , February 2016 , pp. 82 - 86
Copyright
© Microscopy Society of America 2016 

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References

Alonso, E., Timothy, A.M., Wallington, J., Everson, M.P., Field, F.R., Roth, R. & Kirchain, R.E. (2012). Evaluating rare earth element availability: A case with revolutionary demand from clean technologies. Environ Sci Technol 46, 3406–3414.CrossRefGoogle ScholarPubMed
Blanc, P., Baumer, A., Cesbron, F., Ohnenstetter, D., Panczer, G. & Ré-Mond, G. (2000). Systematic cathodoluminescence spectral analysis of synthetic doped minerals: Anhydrite, apatite, calcite, fluorite, scheelite and zircon. In Cathodoluminescence in Geosciences, Pagel, M., Blanc, P. & Ohnenstetter, D. (Eds.), pp. 127–160). Berlin: Springer.CrossRefGoogle Scholar
Gaft, M., Reisfeld, R. & Panczer, G. (2005). Luminescence Spectroscopy of Minerals and Materials. Berlin: Springer.Google Scholar
Macrae, C.M. & Wilson, N.C. (2008). Luminescence database I—Minerals and materials. Microsc Microanal 14, 184–204.CrossRefGoogle ScholarPubMed
Myhajlenko, S. (1998). Cathodoluminescence. In Luminescence of Solids, Vij, D.R. (Ed.), pp. 135–188. New York, NY: Plenum Press.CrossRefGoogle Scholar
Nöite, J. (2003). Method development. In ICP Emission Spectrometry, pp. 148. Weinheim: Wiley-VCH.Google Scholar
Rademaker, J.H, Kleijn, R. & Yang, Y. (2013). Recycling as a strategy against rare earth element criticality: A systemic evaluation of the potential yield of NdFeB magnet recycling. Environ Sci Technol 47, 10129–10136.CrossRefGoogle ScholarPubMed
Renko, M., Osojnik, A. & Hudnik, V. (1995). ICP emission spectrometric analysis of rare earth elements in permanent magnet alloys. Fresenius J Anal Chem 351, 610–613.CrossRefGoogle Scholar
Sagawa, M., Fujimura, S., Togawa, N., Yamamoto, H. & Matsuura, Y. (1984). New material for permanent magnets on a base of Nd and Fe. J Appl Phys 55, 2083–2087.CrossRefGoogle Scholar
Thompson, M., Ramsey, M.H. & Coles, B.J. (1982). Water analysis by inductively coupled plasma atomic emission spectrometry after a rapid preconcentration. Analyst 107, 1286–1288.CrossRefGoogle Scholar
Yacobi, B.G. & Holt, D.B. (1990). Cathodoluminescence Microscopy of Inorganic Solids. New York, NY: Plenum Press.CrossRefGoogle Scholar