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
- 2Citations
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- Citations2
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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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/0038109878906944; http://dx.doi.org/10.1016/0038-1098(78)90694-4; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0017997230&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/0038109878906944; http://dx.doi.org/10.1016/0038-1098%2878%2990694-4; https://dx.doi.org/10.1016/0038-1098%2878%2990694-4
Elsevier BV
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