Abstract
149Sm synchrotron-radiation-based Mössbauer spectroscopy was performed in Sm-based intermetallics having a cubic crystal structure, Sm3Tr4Ge13, SmB6, SmBe13, and SmTr2Al20 (Tr = transition metals). In spite of the difference of the local structure around the Sm sites, the observed Mössbauer spectra consist of a single line at 300 K. On the other hand, Sm LIII-edge X-ray absorption spectra consist of two components, suggesting Sm2+ and Sm3+ states. Difference of the number of the spectral components between the Mössbauer spectroscopy and X-ray absorption spectroscopy is caused by the difference of the time window in the scattering process of these measurements. Correlation between the isomer shifts in the Mössbauer spectroscopy and average Sm valence states estimated from the X-ray absorption spectroscopy exhibits a linear correlation.
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Acknowledgements
Synchrotron radiation experiments of 149Sm SR-based Mössbauer spectroscopy and Sm LIII-edge XAS were performed under the approval of JASRI (Proposal Nos. 2007B1351, 2012B1538, 2014B1139, 2015B1947, 2016A1413, 2017A1060, 2017B1275, 2018A1534, 2018B2038, 2019A1226, 2020A1346, 2020A2025, 2020A2131, and 2021A2052). This work is financially supported by JSPS KAKENHI (Grant Nos. JP20102005 (HeavyElectron), JP21H00157 (High-Entropy Alloy), JP15K14170, JP15H03697, 15K05178, 15H05884, 16K05454, 24740239, JP19H01839 and JP19H04408).
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This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2021), 5-10 September 2021, Brasov, Romania
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Tsutsui, S., Higashinaka, R., Nakamura, R. et al. Sm valence determination of Sm-based Intermetallics using 149Sm Mössbauer and Sm LIII-edge X-ray absorption spectroscopies. Hyperfine Interact 242, 32 (2021). https://doi.org/10.1007/s10751-021-01759-x
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DOI: https://doi.org/10.1007/s10751-021-01759-x