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Phase transitions in oxyfluoride (NH4)2WO2F4

  • Lattice Dynamics and Phase Transitions
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Abstract

(NH4)2WO2F4 single crystals are grown, and their polarization-optical, calorimetric, and birefringence properties are studied in the temperature range 90–350 K. A first-order structural phase transition is found to occur at T 01↑ = 202 K with thermal hysteresis of ΔT 01 ≈ 6–12 K. The phase transition is accompanied by twinning and modification of the symmetry \(Cmcm \leftrightarrow \bar 1\). An additional weak anomaly in the differential scanning calorimeter signal is found at T 02 ≈ 170 K. The total thermal effect of both anomalies is ∑ΔH i = 3200 ± 400 J/mol and ∑ΔS i = 16.5 ± 2.0 J/mol K. The phase transition at T 01 is of the order-disorder type.

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Authors and Affiliations

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

    S. V. Mel’nikova & V. D. Fokina

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

    N. M. Laptash

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  1. S. V. Mel’nikova
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  2. V. D. Fokina
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  3. N. M. Laptash
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Mel’nikova, S.V., Fokina, V.D. & Laptash, N.M. Phase transitions in oxyfluoride (NH4)2WO2F4 . Phys. Solid State 48, 117–121 (2006). https://doi.org/10.1134/S1063783406010239

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  • DOI: https://doi.org/10.1134/S1063783406010239

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