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Probing the phase transition of methane with Mössbauer effect in 57 Fe impurities

Solid State Communications, ISSN: 0038-1098, Vol: 27, Issue: 8, Page: 771-774
1978
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  • Citations
    2
    • Citation Indexes
      2

Article Description

Mossbauer studies were performed in 57 Fe impurities (0.3% at.) in solid methane, in order to investigate the properties of the order-disorder phase transition taking place at T c =20.4K. From the temperature dependence of the relative values of the recoil-free-fraction - f - it was found that near T c a change occurs in the slope of f(T 2 ) without discontinuity in the value of f. A consistent model is proposed by which immediately below T c both phases, I and II coexist with a gradual evolution of the ordered state (II) on the account of the high temperature plastic state (I). The Debye temperature of phase II ( θ II = 101±7K) increases with respect to that of phase I ( θ I = 72±3K), indicating a hardening in the phonon spectrum and precluding the onset of rotational modes of the disordered molecules.

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