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The influence of deuteration on the phase transitions in (NH4)3 Me 3+F6 cryolites (Me 3+=Sc and Ga)

  • Lattice Dynamics and Phase Transitions
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Abstract

The heat capacity of partially deuterated crystals with a cryolite structure, namely, (NH4)3ScF6 and (NH4)3GaF6, is measured in the temperature range from 80 to 370 K. The p-T phase diagrams of these compounds are investigated at pressures up to p=0.6 GPa. It is revealed that the deuteration does not affect the sequences of phase transitions observed in the proton-containing ammonium cryolites studied earlier. The isotope effect most clearly manifests itself in significant changes in the thermodynamic parameters of the \(I12/m1 - P\bar 1\) low-temperature transformation in scandium cryolite.

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Authors and Affiliations

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

    I. N. Flerov, M. V. Gorev, M. L. Afanas’ev & T. V. Ushakova

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  1. I. N. Flerov
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  2. M. V. Gorev
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  3. M. L. Afanas’ev
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  4. T. V. Ushakova
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__________

Translated from Fizika Tverdogo Tela, Vol. 44, No. 10, 2002, pp. 1870–1875.

Original Russian Text Copyright © 2002 by Flerov, Gorev, Afanas’ev, Ushakova.

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Flerov, I.N., Gorev, M.V., Afanas’ev, M.L. et al. The influence of deuteration on the phase transitions in (NH4)3 Me 3+F6 cryolites (Me 3+=Sc and Ga). Phys. Solid State 44, 1961–1966 (2002). https://doi.org/10.1134/1.1514788

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  • DOI: https://doi.org/10.1134/1.1514788

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