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Phase transitions in the (NH4)2NbOF5 oxyfluoride

  • Lattice Dynamics and Phase Transitions
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Abstract

The thermal and dielectric properties of the (NH4)2NbOF5 oxyfluoride have been investigated. It has been established that the structural phase transitions Cmc21 → C2 → Ia observed at the temperatures T 1 = 258.0 K and T 2 = 218.9 K exhibit a nonferroelectric nature. The hydrostatic pressure, which stabilizes the initial phase and destabilizes the low-temperature phase, hardly affects the temperature range of stability of the intermediate phase. The model of sequential ordering of the structural elements due to phase transitions has been analyzed using experimental data on the entropies of the phase transitions.

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Authors and Affiliations

  1. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, 660036, Russia

    V. D. Fokina, E. V. Bogdanov, M. V. Gorev, M. S. Molokeev & I. N. Flerov

  2. Siberian Federal University, pr. Svobodny 79, Krasnoyarsk, 660041, Russia

    V. D. Fokina, M. V. Gorev, E. I. Pogorel’tsev & I. N. Flerov

  3. Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia

    N. M. Laptash

Authors
  1. V. D. Fokina
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  2. E. V. Bogdanov
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  3. M. V. Gorev
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  4. M. S. Molokeev
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  5. E. I. Pogorel’tsev
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  6. I. N. Flerov
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  7. N. M. Laptash
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Corresponding authors

Correspondence to V. D. Fokina or I. N. Flerov.

Additional information

Original Russian Text © V.D. Fokina, E.V. Bogdanov, M.V. Gorev, M.S. Molokeev, E.I. Pogorel’tsev, I.N. Flerov, N.M. Laptash, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 4, pp. 728–734.

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Fokina, V.D., Bogdanov, E.V., Gorev, M.V. et al. Phase transitions in the (NH4)2NbOF5 oxyfluoride. Phys. Solid State 52, 781–788 (2010). https://doi.org/10.1134/S1063783410040189

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  • DOI: https://doi.org/10.1134/S1063783410040189

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