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Pressure-induced phase transition in the cubic ScF3 crystal

  • Lattice Dynamics and Phase Transitions
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Abstract

Pressure-induced phase transitions in the ScF3 crystal were studied using synchrotron radiation diffraction, polarization microscopy, and Raman spectroscopy. The phase existing in the range 0.6–3.0 GPa is optically anisotropic; its structure is described by space group R 3 c (Z = 2), and the transition is due to rotation of ScF6 octahedra around a threefold axis. The pressure dependence of the structural parameters and angle of rotation are determined. The number of Raman spectral lines corresponds to that expected for this structure; above the phase transition point, a recovery of soft modes takes place. At a pressure of 3.0 GPa, a transition occurs to a new phase, which remains metastable as the pressure decreases. The results are interpreted using an ab initio method based on the Gordon-Kim approach.

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Authors and Affiliations

  1. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia

    K. S. Aleksandrov, V. N. Voronov, A. N. Vtyurin, A. S. Krylov, M. S. Molokeev & M. S. Pavlovskiĭ

  2. Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    S. V. Goryaĭnov & A. Yu. Likhacheva

  3. Institute of Solid State Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091, Russia

    A. I. Ancharov

Authors
  1. K. S. Aleksandrov
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  2. V. N. Voronov
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  3. A. N. Vtyurin
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  4. A. S. Krylov
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  5. M. S. Molokeev
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  6. M. S. Pavlovskiĭ
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  7. S. V. Goryaĭnov
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  8. A. Yu. Likhacheva
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  9. A. I. Ancharov
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Corresponding author

Correspondence to A. N. Vtyurin.

Additional information

Original Russian Text © K.S. Aleksandrov, V.N. Voronov, A.N. Vtyurin, A.S. Krylov, M.S. Molokeev, M.S. Pavlovskiĭ, S.V. Goryaĭnov, A.Yu. Likhacheva, A.I. Ancharov, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 4, pp. 764–770.

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Aleksandrov, K.S., Voronov, V.N., Vtyurin, A.N. et al. Pressure-induced phase transition in the cubic ScF3 crystal. Phys. Solid State 51, 810–816 (2009). https://doi.org/10.1134/S1063783409040295

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  • DOI: https://doi.org/10.1134/S1063783409040295

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