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Martensite transformations and phase diagram of solid methane

  • Solid State Physics
  • Published:
Soviet Physics Journal Aims and scope

Abstract

Processing of the data of x-ray investigation of the diffraction scattering function of the 311 reflection in the temperature range 6–30°K shows that the phase transformation in methane is of the martensite type. The martensite points Ms and Mf limiting the region of the heterophase are determined on the phase diagram. The 16-molecule bct cell established in theα-phase of CD4 as well as the manifestation of birefringence in CH4 and its isotopes leads to the conclusion that in these substances, as a result of molecular ordering, a lattice rearrangement from fcc to bct takes place, in accordance with the Bain orientation. The existence of an intermediate phase which is unstable in methane but stable in all its isotopes explains the presence respectively of one and two λ-anomalies in the specific heat.

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Author information

Authors and Affiliations

  1. Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, USSR

    V. M. Gasan & P. A. Bezuglyi

Authors
  1. V. M. Gasan
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  2. P. A. Bezuglyi
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Additional information

Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 58–64, March, 1984.

The authors are grateful to L. V. Skibina and M. M. Chernik for discussion of the results, and V. B. Filatova for assistance in the design of this experiment.

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Gasan, V.M., Bezuglyi, P.A. Martensite transformations and phase diagram of solid methane. Soviet Physics Journal 27, 218–223 (1984). https://doi.org/10.1007/BF00912199

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  • DOI: https://doi.org/10.1007/BF00912199

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