Abstract
The parameters of the local crystal structure of dodecaborides RB12 (R = Ho, Er, Tm, Yb, Lu) have been determined by extended X-ray absorption fine structure (EXAFS) spectroscopy. It has been shown that the vibrations of the rare-earth ion with respect to the boron cage are well described in the harmonic approximation. At the same time, the displacement of rare-earth ions from equilibrium positions of the crystal structure should be taken into account to determine the length of the R-B bond. The analysis of EXAFS spectra has revealed the displacement of 1–6% of rare-earth ions by about 0.2–0.3 Å in all compounds under investigation; this displacement at low temperatures results in the formation of a cage glass phase.
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Original Russian Text © A.P. Menushenkov, A.A. Yaroslavtsev, I.A. Zaluzhnyy, A.V. Kuznetsov, R.V. Chernikov, N.Yu. Shitsevalova, V.B. Filippov, 2013, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2013, Vol. 98, No. 3, pp. 187–192.
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Menushenkov, A.P., Yaroslavtsev, A.A., Zaluzhnyy, I.A. et al. Features of the local structure of rare-earth dodecaborides RB12 (R = Ho, Er, Tm, Yb, Lu). Jetp Lett. 98, 165–169 (2013). https://doi.org/10.1134/S002136401316011X
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DOI: https://doi.org/10.1134/S002136401316011X