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Optical studies of phase transitions in the (NH4)3Ti(O2)F5 crystal

  • Lattice Dynamics and Phase Transitions
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Abstract

Polarization-optical study of twinning and measurements of the Raman spectra and birefringence in oxyfluoride (NH4)3Ti(O2)F5 were carried out over the temperature range 90–350 K. Phase transitions were detected at temperatures T 01 = 266 K (second-order transition) and T 02 = 225 K (first order). It is assumed that the crystal symmetry is changed as follows: Fm3m ↔ I4/mmm ↔ I4/m. Anomalies of the spectral parameters are established in the frequency range of internal vibrations of ammonium ions and Ti(O2)F5 complexes. An analysis of the results shows that the transition at T 01 is likely due to small shifts of the tetrahedral groups from their position on the triad axis and that the transition at T 02 is due to fluorine-oxygen ordering of Ti(O2)F5 complexes.

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Authors and Affiliations

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

    S. V. Mel’nikova, A. S. Krylov & A. L. Zhogal’

  2. Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia

    N. M. Laptash

Authors
  1. S. V. Mel’nikova
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  2. A. S. Krylov
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  3. A. L. Zhogal’
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  4. N. M. Laptash
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Correspondence to S. V. Mel’nikova.

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Original Russian Text © S.V. Mel’nikova, A.S. Krylov, A.L. Zhogal’, N.M. Laptash, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 4, pp. 771–776.

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Mel’nikova, S.V., Krylov, A.S., Zhogal’, A.L. et al. Optical studies of phase transitions in the (NH4)3Ti(O2)F5 crystal. Phys. Solid State 51, 817–822 (2009). https://doi.org/10.1134/S1063783409040301

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  • DOI: https://doi.org/10.1134/S1063783409040301

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